# 道路運送車両法 / Road Transport Vehicle Act — 第三章 (Chapter 3)

- Law: 道路運送車両法 (Road Transport Vehicle Act), 昭和二十六年法律第百八十五号
- English title "Road Transport Vehicle Act": Ministry of Justice translation database, which lists the title
- Kind: Act — the distinction between 法律 (Act), 政令 (Cabinet Order), 省令 (Ministerial Order) and 条例 (local ordinance) decides who may issue it and what it may say.
- Provision: 第三章 (Chapter 3) — address `ch-3`
- Text in force since: 2026-04-01
- URL (the page that opens at this provision): https://japanlaw.org/en/road-transport-vehicle-act/ch-3
- Permanent URL (e-Gov law ID, never renamed): https://japanlaw.org/l/326AC0000000185/ch-3
- Every provision below carries its address and both URLs on the line under it.
- Japanese text: e-Gov 法令検索, Digital Agency (デジタル庁). English: as marked on each line below.

Only the Japanese as published by the government has legal effect; the text
below is a copy of it. Every English rendering below is a translation and
says which kind: the Ministry of Justice's translation, or this
site's machine translation, whose model and date the Sources list names.
They are never merged and never substituted for one another.

---

## 第三章　道路運送車両の保安基準 — Chapter III Safety Standards for Road Transport Vehicles
<sup>heading: machine translation, not official</sup>
<sup>ch-3 · https://japanlaw.org/en/road-transport-vehicle-act/ch-3 · https://japanlaw.org/l/326AC0000000185/ch-3</sup>

### 第四十条（自動車の構造） — Structure of Motor Vehicles
<sup>caption: machine translation, not official</sup>
<sup>art-40 · https://japanlaw.org/en/road-transport-vehicle-act/art-40 · https://japanlaw.org/l/326AC0000000185/art-40</sup>

**第一項**  自動車は、その構造が、次に掲げる事項について、国土交通省令で定める保安上又は公害防止その他の環境保全上の技術基準に適合するものでなければ、運行の用に供してはならない。
<sup>art-40/par-1 · https://japanlaw.org/en/road-transport-vehicle-act/art-40/par-1 · https://japanlaw.org/l/326AC0000000185/art-40/par-1</sup>
A motor vehicle must not be used for operation unless its structure conforms, with respect to the following matters, to the technical standards for safety, or for pollution prevention and other conservation of the environment, prescribed by Order of the Ministry of Land, Infrastructure, Transport and Tourism:
<sup>machine translation, not official</sup>

  **一**  長さ、幅及び高さ
  <sup>art-40/par-1/item-1 · https://japanlaw.org/en/road-transport-vehicle-act/art-40/par-1/item-1 · https://japanlaw.org/l/326AC0000000185/art-40/par-1/item-1</sup>
  length, width and height;
  <sup>machine translation, not official</sup>

  **二**  最低地上高
  <sup>art-40/par-1/item-2 · https://japanlaw.org/en/road-transport-vehicle-act/art-40/par-1/item-2 · https://japanlaw.org/l/326AC0000000185/art-40/par-1/item-2</sup>
  minimum ground clearance;
  <sup>machine translation, not official</sup>

  **三**  車両総重量（車両重量、最大積載量及び五十五キログラムに乗車定員を乗じて得た重量の総和をいう。）
  <sup>art-40/par-1/item-3 · https://japanlaw.org/en/road-transport-vehicle-act/art-40/par-1/item-3 · https://japanlaw.org/l/326AC0000000185/art-40/par-1/item-3</sup>
  gross vehicle weight (meaning the sum of the vehicle weight, the maximum load capacity and the weight obtained by multiplying 55 kilograms by the seating capacity);
  <sup>machine translation, not official</sup>

  **四**  車輪にかかる荷重
  <sup>art-40/par-1/item-4 · https://japanlaw.org/en/road-transport-vehicle-act/art-40/par-1/item-4 · https://japanlaw.org/l/326AC0000000185/art-40/par-1/item-4</sup>
  load on the wheels;
  <sup>machine translation, not official</sup>

  **五**  車輪にかかる荷重の車両重量（運行に必要な装備をした状態における自動車の重量をいう。）に対する割合
  <sup>art-40/par-1/item-5 · https://japanlaw.org/en/road-transport-vehicle-act/art-40/par-1/item-5 · https://japanlaw.org/l/326AC0000000185/art-40/par-1/item-5</sup>
  ratio of the load on the wheels to the vehicle weight (meaning the weight of the motor vehicle when equipped with the equipment necessary for operation);
  <sup>machine translation, not official</sup>

  **六**  車輪にかかる荷重の車両総重量に対する割合
  <sup>art-40/par-1/item-6 · https://japanlaw.org/en/road-transport-vehicle-act/art-40/par-1/item-6 · https://japanlaw.org/l/326AC0000000185/art-40/par-1/item-6</sup>
  ratio of the load on the wheels to the gross vehicle weight;
  <sup>machine translation, not official</sup>

  **七**  最大安定傾斜角度
  <sup>art-40/par-1/item-7 · https://japanlaw.org/en/road-transport-vehicle-act/art-40/par-1/item-7 · https://japanlaw.org/l/326AC0000000185/art-40/par-1/item-7</sup>
  maximum stable inclination angle;
  <sup>machine translation, not official</sup>

  **八**  最小回転半径
  <sup>art-40/par-1/item-8 · https://japanlaw.org/en/road-transport-vehicle-act/art-40/par-1/item-8 · https://japanlaw.org/l/326AC0000000185/art-40/par-1/item-8</sup>
  minimum turning radius;
  <sup>machine translation, not official</sup>

  **九**  接地部及び接地圧
  <sup>art-40/par-1/item-9 · https://japanlaw.org/en/road-transport-vehicle-act/art-40/par-1/item-9 · https://japanlaw.org/l/326AC0000000185/art-40/par-1/item-9</sup>
  ground contact area and ground contact pressure.
  <sup>machine translation, not official</sup>

### 第四十一条（自動車の装置） — Equipment of Motor Vehicles
<sup>caption: machine translation, not official</sup>
<sup>art-41 · https://japanlaw.org/en/road-transport-vehicle-act/art-41 · https://japanlaw.org/l/326AC0000000185/art-41</sup>

**第一項**  自動車は、次に掲げる装置について、国土交通省令で定める保安上又は公害防止その他の環境保全上の技術基準に適合するものでなければ、運行の用に供してはならない。
<sup>art-41/par-1 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1 · https://japanlaw.org/l/326AC0000000185/art-41/par-1</sup>
A motor vehicle must not be used for operation unless its following equipment conforms to the technical standards for safety, or for pollution prevention and other conservation of the environment, prescribed by Order of the Ministry of Land, Infrastructure, Transport and Tourism:
<sup>machine translation, not official</sup>

  **一**  原動機及び動力伝達装置
  <sup>art-41/par-1/item-1 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-1 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-1</sup>
  motor and power transmission equipment;
  <sup>machine translation, not official</sup>

  **二**  車輪及び車軸、そりその他の走行装置
  <sup>art-41/par-1/item-2 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-2 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-2</sup>
  wheels and axles, runners and other running gear;
  <sup>machine translation, not official</sup>

  **三**  操縦装置
  <sup>art-41/par-1/item-3 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-3 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-3</sup>
  steering equipment;
  <sup>machine translation, not official</sup>

  **四**  制動装置
  <sup>art-41/par-1/item-4 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-4 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-4</sup>
  braking equipment;
  <sup>machine translation, not official</sup>

  **五**  ばねその他の緩衝装置
  <sup>art-41/par-1/item-5 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-5 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-5</sup>
  springs and other shock-absorbing equipment;
  <sup>machine translation, not official</sup>

  **六**  燃料装置及び電気装置
  <sup>art-41/par-1/item-6 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-6 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-6</sup>
  fuel equipment and electrical equipment;
  <sup>machine translation, not official</sup>

  **七**  車枠及び車体
  <sup>art-41/par-1/item-7 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-7 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-7</sup>
  frame and vehicle body;
  <sup>machine translation, not official</sup>

  **八**  連結装置
  <sup>art-41/par-1/item-8 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-8 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-8</sup>
  coupling equipment;
  <sup>machine translation, not official</sup>

  **九**  乗車装置及び物品積載装置
  <sup>art-41/par-1/item-9 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-9 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-9</sup>
  passenger equipment and cargo-loading equipment;
  <sup>machine translation, not official</sup>

  **十**  前面ガラスその他の窓ガラス
  <sup>art-41/par-1/item-10 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-10 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-10</sup>
  windshield and other window glass;
  <sup>machine translation, not official</sup>

  **十一**  消音器その他の騒音防止装置
  <sup>art-41/par-1/item-11 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-11 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-11</sup>
  muffler and other noise prevention equipment;
  <sup>machine translation, not official</sup>

  **十二**  ばい煙、悪臭のあるガス、有毒なガス等の発散防止装置
  <sup>art-41/par-1/item-12 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-12 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-12</sup>
  devices for preventing the emission of smoke, foul-smelling gases, toxic gases, etc.;
  <sup>machine translation, not official</sup>

  **十三**  前照灯、番号灯、尾灯、制動灯、車幅灯その他の灯火装置及び反射器
  <sup>art-41/par-1/item-13 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-13 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-13</sup>
  headlamps, number lamps, tail lamps, brake lamps, side lamps and other lighting equipment, and reflectors;
  <sup>machine translation, not official</sup>

  **十四**  警音器その他の警報装置
  <sup>art-41/par-1/item-14 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-14 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-14</sup>
  horn and other warning equipment;
  <sup>machine translation, not official</sup>

  **十五**  方向指示器その他の指示装置
  <sup>art-41/par-1/item-15 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-15 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-15</sup>
  direction indicators and other indicating equipment;
  <sup>machine translation, not official</sup>

  **十六**  後写鏡、窓拭き器その他の視野を確保する装置
  <sup>art-41/par-1/item-16 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-16 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-16</sup>
  rear-view mirror, windshield wipers and other equipment for securing a field of view;
  <sup>machine translation, not official</sup>

  **十七**  速度計、走行距離計その他の計器
  <sup>art-41/par-1/item-17 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-17 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-17</sup>
  speedometer, odometer and other instruments;
  <sup>machine translation, not official</sup>

  **十八**  消火器その他の防火装置
  <sup>art-41/par-1/item-18 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-18 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-18</sup>
  fire extinguisher and other fire prevention equipment;
  <sup>machine translation, not official</sup>

  **十九**  内圧容器及びその附属装置
  <sup>art-41/par-1/item-19 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-19 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-19</sup>
  internal pressure vessels and their accessory equipment;
  <sup>machine translation, not official</sup>

  **二十**  自動運行装置
  <sup>art-41/par-1/item-20 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-20 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-20</sup>
  automated operation device;
  <sup>machine translation, not official</sup>

  **二十一**  その他政令で定める特に必要な自動車の装置
  <sup>art-41/par-1/item-21 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-21 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-21</sup>
  other motor vehicle equipment that is particularly necessary and specified by Cabinet Order.
  <sup>machine translation, not official</sup>

**第二項**  前項第二十号の「自動運行装置」とは、プログラム（電子計算機（入出力装置を含む。この項及び第九十九条の三第一項第一号を除き、以下同じ。）に対する指令であつて、一の結果を得ることができるように組み合わされたものをいう。以下同じ。）により自動的に自動車を運行させるために必要な、自動車の運行時の状態及び周囲の状況を検知するためのセンサー並びに当該センサーから送信された情報を処理するための電子計算機及びプログラムを主たる構成要素とする装置であつて、当該装置ごとに国土交通大臣が付する条件で使用される場合において、自動車を運行する者の操縦に係る認知、予測、判断及び操作に係る能力の全部を代替する機能を有し、かつ、当該機能の作動状態の確認に必要な情報を記録するための装置を備えるものをいう。
<sup>art-41/par-2 · https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-2 · https://japanlaw.org/l/326AC0000000185/art-41/par-2</sup>
The "automated operation device" referred to in item (xx) of the preceding paragraph means a device whose principal components are sensors for detecting the state of a motor vehicle during operation and its surrounding conditions, and a computer and program for processing the information transmitted from those sensors, which are necessary to cause a motor vehicle to operate automatically by means of a program (meaning commands to a computer (including input/output devices; except in this paragraph and Article 99-3, paragraph (1), item (i), the same applies hereinafter) that are combined so as to obtain a single result; the same applies hereinafter), and which, when used under conditions attached by the Minister of Land, Infrastructure, Transport and Tourism for each such device, has a function that substitutes for all of the capabilities relating to perception, prediction, judgment and control involved in driving by the person who operates the motor vehicle, and is also equipped with a device for recording the information necessary for confirming the operating state of that function.
<sup>machine translation, not official</sup>

### 第四十二条（乗車定員又は最大積載量） — Seating Capacity or Maximum Load Capacity
<sup>caption: machine translation, not official</sup>
<sup>art-42 · https://japanlaw.org/en/road-transport-vehicle-act/art-42 · https://japanlaw.org/l/326AC0000000185/art-42</sup>

**第一項**  自動車は、乗車定員又は最大積載量について、国土交通省令で定める保安上又は公害防止その他の環境保全上の技術基準に適合するものでなければ、運行の用に供してはならない。
<sup>art-42/par-1 · https://japanlaw.org/en/road-transport-vehicle-act/art-42/par-1 · https://japanlaw.org/l/326AC0000000185/art-42/par-1</sup>
A motor vehicle must not be used for operation unless it conforms, with respect to seating capacity or maximum load capacity, to the technical standards for safety, or for pollution prevention and other conservation of the environment, prescribed by Order of the Ministry of Land, Infrastructure, Transport and Tourism.
<sup>machine translation, not official</sup>

### 第四十三条（自動車の保安上の技術基準についての制限の付加） — Addition of Restrictions Concerning Technical Standards for the Safety of Motor Vehicles
<sup>caption: machine translation, not official</sup>
<sup>art-43 · https://japanlaw.org/en/road-transport-vehicle-act/art-43 · https://japanlaw.org/l/326AC0000000185/art-43</sup>

**第一項**  地方運輸局長は、勾配、曲折、ぬかるみ、積雪、結氷その他の路面の状況等により保安上危険な道路において主として運行する自動車の使用者に対し、当該自動車につき、第四十条の規定による同条各号についての制限、第四十一条第一項の規定による走行装置、制動装置、灯火装置若しくは警報装置についての制限又は前条の規定による乗車定員若しくは最大積載量についての制限を付加することができる。
<sup>art-43/par-1 · https://japanlaw.org/en/road-transport-vehicle-act/art-43/par-1 · https://japanlaw.org/l/326AC0000000185/art-43/par-1</sup>
The Director of a District Transport Bureau may, with respect to the user of a motor vehicle that is mainly in operation on a road that is dangerous in terms of safety owing to road surface conditions, etc., such as gradient, bends, mud, accumulated snow or ice, add to that motor vehicle the restrictions on the matters in the items of Article 40 under that Article, the restrictions on the running gear, braking equipment, lighting equipment or warning equipment under Article 41, paragraph (1), or the restrictions on seating capacity or maximum load capacity under the preceding Article.
<sup>machine translation, not official</sup>

**第二項**  地方運輸局長は、前項の行為をするときは、あらかじめ、国土交通大臣の承認を受けなければならない。
<sup>art-43/par-2 · https://japanlaw.org/en/road-transport-vehicle-act/art-43/par-2 · https://japanlaw.org/l/326AC0000000185/art-43/par-2</sup>
When the Director of a District Transport Bureau is to take the action referred to in the preceding paragraph, the Director must obtain the approval of the Minister of Land, Infrastructure, Transport and Tourism in advance.
<sup>machine translation, not official</sup>

### 第四十四条（原動機付自転車の構造及び装置） — Structure and Equipment of Motorized Bicycles
<sup>caption: machine translation, not official</sup>
<sup>art-44 · https://japanlaw.org/en/road-transport-vehicle-act/art-44 · https://japanlaw.org/l/326AC0000000185/art-44</sup>

**第一項**  原動機付自転車は、次に掲げる事項について、国土交通省令で定める保安上又は公害防止その他の環境保全上の技術基準に適合するものでなければ、運行の用に供してはならない。
<sup>art-44/par-1 · https://japanlaw.org/en/road-transport-vehicle-act/art-44/par-1 · https://japanlaw.org/l/326AC0000000185/art-44/par-1</sup>
A motorized bicycle must not be used for operation unless it conforms, with respect to the following matters, to the technical standards for safety, or for pollution prevention and other conservation of the environment, prescribed by Order of the Ministry of Land, Infrastructure, Transport and Tourism:
<sup>machine translation, not official</sup>

  **一**  長さ、幅及び高さ
  <sup>art-44/par-1/item-1 · https://japanlaw.org/en/road-transport-vehicle-act/art-44/par-1/item-1 · https://japanlaw.org/l/326AC0000000185/art-44/par-1/item-1</sup>
  length, width and height;
  <sup>machine translation, not official</sup>

  **二**  接地部及び接地圧
  <sup>art-44/par-1/item-2 · https://japanlaw.org/en/road-transport-vehicle-act/art-44/par-1/item-2 · https://japanlaw.org/l/326AC0000000185/art-44/par-1/item-2</sup>
  ground contact area and ground contact pressure;
  <sup>machine translation, not official</sup>

  **三**  制動装置
  <sup>art-44/par-1/item-3 · https://japanlaw.org/en/road-transport-vehicle-act/art-44/par-1/item-3 · https://japanlaw.org/l/326AC0000000185/art-44/par-1/item-3</sup>
  braking equipment;
  <sup>machine translation, not official</sup>

  **四**  車体
  <sup>art-44/par-1/item-4 · https://japanlaw.org/en/road-transport-vehicle-act/art-44/par-1/item-4 · https://japanlaw.org/l/326AC0000000185/art-44/par-1/item-4</sup>
  vehicle body;
  <sup>machine translation, not official</sup>

  **五**  ばい煙、悪臭のあるガス、有毒なガス等の発散防止装置
  <sup>art-44/par-1/item-5 · https://japanlaw.org/en/road-transport-vehicle-act/art-44/par-1/item-5 · https://japanlaw.org/l/326AC0000000185/art-44/par-1/item-5</sup>
  devices for preventing the emission of smoke, foul-smelling gases, toxic gases, etc.;
  <sup>machine translation, not official</sup>

  **六**  前照灯、番号灯、尾灯、制動灯及び後部反射器
  <sup>art-44/par-1/item-6 · https://japanlaw.org/en/road-transport-vehicle-act/art-44/par-1/item-6 · https://japanlaw.org/l/326AC0000000185/art-44/par-1/item-6</sup>
  headlamps, number lamps, tail lamps, brake lamps and rear reflectors;
  <sup>machine translation, not official</sup>

  **七**  警音器
  <sup>art-44/par-1/item-7 · https://japanlaw.org/en/road-transport-vehicle-act/art-44/par-1/item-7 · https://japanlaw.org/l/326AC0000000185/art-44/par-1/item-7</sup>
  horn;
  <sup>machine translation, not official</sup>

  **八**  消音器
  <sup>art-44/par-1/item-8 · https://japanlaw.org/en/road-transport-vehicle-act/art-44/par-1/item-8 · https://japanlaw.org/l/326AC0000000185/art-44/par-1/item-8</sup>
  muffler;
  <sup>machine translation, not official</sup>

  **九**  方向指示器
  <sup>art-44/par-1/item-9 · https://japanlaw.org/en/road-transport-vehicle-act/art-44/par-1/item-9 · https://japanlaw.org/l/326AC0000000185/art-44/par-1/item-9</sup>
  direction indicators;
  <sup>machine translation, not official</sup>

  **十**  後写鏡
  <sup>art-44/par-1/item-10 · https://japanlaw.org/en/road-transport-vehicle-act/art-44/par-1/item-10 · https://japanlaw.org/l/326AC0000000185/art-44/par-1/item-10</sup>
  rear-view mirror;
  <sup>machine translation, not official</sup>

  **十一**  速度計
  <sup>art-44/par-1/item-11 · https://japanlaw.org/en/road-transport-vehicle-act/art-44/par-1/item-11 · https://japanlaw.org/l/326AC0000000185/art-44/par-1/item-11</sup>
  speedometer.
  <sup>machine translation, not official</sup>

### 第四十五条（軽車両の構造及び装置） — Structure and Equipment of Light Road Vehicles
<sup>caption: machine translation, not official</sup>
<sup>art-45 · https://japanlaw.org/en/road-transport-vehicle-act/art-45 · https://japanlaw.org/l/326AC0000000185/art-45</sup>

**第一項**  軽車両は、次に掲げる事項について、国土交通省令で定める保安上の技術基準に適合するものでなければ、運行の用に供してはならない。
<sup>art-45/par-1 · https://japanlaw.org/en/road-transport-vehicle-act/art-45/par-1 · https://japanlaw.org/l/326AC0000000185/art-45/par-1</sup>
A light road vehicle must not be used for operation unless it conforms, with respect to the following matters, to the technical standards for safety prescribed by Order of the Ministry of Land, Infrastructure, Transport and Tourism:
<sup>machine translation, not official</sup>

  **一**  長さ、幅及び高さ
  <sup>art-45/par-1/item-1 · https://japanlaw.org/en/road-transport-vehicle-act/art-45/par-1/item-1 · https://japanlaw.org/l/326AC0000000185/art-45/par-1/item-1</sup>
  length, width and height;
  <sup>machine translation, not official</sup>

  **二**  接地部及び接地圧
  <sup>art-45/par-1/item-2 · https://japanlaw.org/en/road-transport-vehicle-act/art-45/par-1/item-2 · https://japanlaw.org/l/326AC0000000185/art-45/par-1/item-2</sup>
  ground contact area and ground contact pressure;
  <sup>machine translation, not official</sup>

  **三**  制動装置
  <sup>art-45/par-1/item-3 · https://japanlaw.org/en/road-transport-vehicle-act/art-45/par-1/item-3 · https://japanlaw.org/l/326AC0000000185/art-45/par-1/item-3</sup>
  braking equipment;
  <sup>machine translation, not official</sup>

  **四**  車体
  <sup>art-45/par-1/item-4 · https://japanlaw.org/en/road-transport-vehicle-act/art-45/par-1/item-4 · https://japanlaw.org/l/326AC0000000185/art-45/par-1/item-4</sup>
  vehicle body;
  <sup>machine translation, not official</sup>

  **五**  警音器
  <sup>art-45/par-1/item-5 · https://japanlaw.org/en/road-transport-vehicle-act/art-45/par-1/item-5 · https://japanlaw.org/l/326AC0000000185/art-45/par-1/item-5</sup>
  horn.
  <sup>machine translation, not official</sup>

### 第四十六条（保安基準の原則） — Principles of Safety Standards
<sup>caption: machine translation, not official</sup>
<sup>art-46 · https://japanlaw.org/en/road-transport-vehicle-act/art-46 · https://japanlaw.org/l/326AC0000000185/art-46</sup>

**第一項**  第四十条から第四十二条まで、第四十四条及び前条の規定による保安上又は公害防止その他の環境保全上の技術基準（以下「保安基準」という。）は、道路運送車両の構造及び装置が運行に十分堪え、操縦その他の使用のための作業に安全であるとともに、通行人その他に危害を与えないことを確保するものでなければならず、かつ、これにより製作者又は使用者に対し、自動車の製作又は使用について不当な制限を課することとなるものであつてはならない。
<sup>art-46/par-1 · https://japanlaw.org/en/road-transport-vehicle-act/art-46/par-1 · https://japanlaw.org/l/326AC0000000185/art-46/par-1</sup>
The technical standards for safety, or for pollution prevention and other conservation of the environment, under Articles 40 through 42, Article 44 and the preceding Article (hereinafter referred to as "safety standards") must ensure that the structure and equipment of road transport vehicles are sufficient to withstand operation, are safe for driving and other work involved in their use, and do not cause harm to passersby or others, and must not thereby impose unjust restrictions on manufacturers or users in the manufacture or use of motor vehicles.
<sup>machine translation, not official</sup>

---

## Cites
- art-41/par-2: 前項第二十号 → 道路運送車両法 第四十一条第一項第二十号 (Article 41, paragraph (1), item (xx)), art-41/par-1/item-20 — https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1/item-20 · https://japanlaw.org/l/326AC0000000185/art-41/par-1/item-20
- art-41/par-2: この項 → 道路運送車両法 第四十一条第二項 (Article 41, paragraph (2)), art-41/par-2 — https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-2 · https://japanlaw.org/l/326AC0000000185/art-41/par-2
- art-41/par-2: 第九十九条の三第一項第一号 → 道路運送車両法 第九十九条の三第一項第一号 (Article 99-3, paragraph (1), item (i)), art-99-3/par-1/item-1 — https://japanlaw.org/en/road-transport-vehicle-act/art-99-3/par-1/item-1 · https://japanlaw.org/l/326AC0000000185/art-99-3/par-1/item-1
- art-43/par-1: 第四十条 → 道路運送車両法 第四十条 (Article 40), art-40 — https://japanlaw.org/en/road-transport-vehicle-act/art-40 · https://japanlaw.org/l/326AC0000000185/art-40
- art-43/par-1: 第四十一条第一項 → 道路運送車両法 第四十一条第一項 (Article 41, paragraph (1)), art-41/par-1 — https://japanlaw.org/en/road-transport-vehicle-act/art-41/par-1 · https://japanlaw.org/l/326AC0000000185/art-41/par-1
- art-43/par-1: 前条 → 道路運送車両法 第四十二条 (Article 42), art-42 — https://japanlaw.org/en/road-transport-vehicle-act/art-42 · https://japanlaw.org/l/326AC0000000185/art-42
- art-43/par-2: 前項 → 道路運送車両法 第四十三条第一項 (Article 43, paragraph (1)), art-43/par-1 — https://japanlaw.org/en/road-transport-vehicle-act/art-43/par-1 · https://japanlaw.org/l/326AC0000000185/art-43/par-1
- art-46/par-1: 第四十条から第四十二条まで → 道路運送車両法 第四十条 (Article 40), art-40 — https://japanlaw.org/en/road-transport-vehicle-act/art-40 · https://japanlaw.org/l/326AC0000000185/art-40
- art-46/par-1: 第四十条から第四十二条まで → 道路運送車両法 第四十一条 (Article 41), art-41 — https://japanlaw.org/en/road-transport-vehicle-act/art-41 · https://japanlaw.org/l/326AC0000000185/art-41
- art-46/par-1: 第四十条から第四十二条まで → 道路運送車両法 第四十二条 (Article 42), art-42 — https://japanlaw.org/en/road-transport-vehicle-act/art-42 · https://japanlaw.org/l/326AC0000000185/art-42
- art-46/par-1: 第四十四条 → 道路運送車両法 第四十四条 (Article 44), art-44 — https://japanlaw.org/en/road-transport-vehicle-act/art-44 · https://japanlaw.org/l/326AC0000000185/art-44
- art-46/par-1: 前条 → 道路運送車両法 第四十五条 (Article 45), art-45 — https://japanlaw.org/en/road-transport-vehicle-act/art-45 · https://japanlaw.org/l/326AC0000000185/art-45

---

## Sources

- e-Gov 法令検索, Digital Agency (デジタル庁) — 道路運送車両法 — the text in force from 2026-04-01 (https://laws.e-gov.go.jp/law/326AC0000000185/20260401_508AC0000000002), retrieved 2026-10-13
- Japanese Law Translation Database System, Ministry of Justice (法務省) — 道路運送車両法 — its English title as the Ministry of Justice's translation database lists it (https://www.japaneselawtranslation.go.jp/en/laws/view/529), retrieved 2026-09-18
- claude-sonnet-5-5 — Machine translation, batch road-transport-vehicle-act-20261013T120733-008, translated 2026-10-13
- claude-sonnet-5-5 — Machine translation, batch road-transport-vehicle-act-20261013T120733-009, translated 2026-10-13
- claude-sonnet-5-5 — Machine translation, batch road-transport-vehicle-act-20261013T120733-010, translated 2026-10-13
- claude-sonnet-5-5 — Machine translation, batch road-transport-vehicle-act-20261013T124808-001, translated 2026-10-13
- This site's parser, version 189 — 道路運送車両法 — structure, counts, cross-references and defined terms, computed 2026-10-13
