The driver of a vehicle or streetcar (other than a light road vehicle that is not a bicycle; the same applies hereinafter in this Article) must sound the horn:
when about to proceed through a blind intersection, around a blind curve, or over a blind summit at a place designated by a road sign or marking;
when about to proceed through a blind intersection, around a blind curve, or over a blind summit when on a stretch of road designated by a road sign or marking as a mountain road or road with many curves.
The driver of a vehicle or streetcar must not sound the horn unless required to do so pursuant to laws and regulations; provided, however, that this does not apply if sounding the horn is necessary in order to prevent a hazard.
Read this with the articles around it
(Using the Horn)
The driver of a vehicle or streetcar (other than a light road vehicle that is not a bicycle; the same applies hereinafter in this Article) must sound the horn:
車両等（自転車以外の軽車両を除く。以下この条において同じ。）の運転者は、次の各号に掲げる場合においては、警音器を鳴らさなければならない。
Open this provisionroad
「道路」
A road as defined in the Road Act, a motor vehicle road (自動車道) as defined in the Road Transportation Act, and any other place used for general traffic.
Defined inArticle 2, paragraph (1), item (i)· applies throughout the law
road sign or markingmachine translation
「道路標識等」
A road sign (道路標識) or a road marking (道路標示).
Short name set inArticle 2, paragraph (1), item (iv)
intersection
「交差点」
The part where two or more roads meet at a crossroads, T-junction or other junction; where a road has separate sidewalks and roadway, the part where the roadways meet.
Defined inArticle 2, paragraph (1), item (v)· applies throughout the law
light road vehiclemachine translation
「軽車両」
A bicycle, cart or other vehicle moved by human or animal power or towed by another vehicle without rails (including sleds and horses or cattle, but not children's vehicles), or a motorized vehicle a Cabinet Office Order (内閣府令) treats as like one, other than small mobility vehicles (移動用小型車), vehicles for persons with physical disabilities (身体障害者用の車), walking-aid carts (歩行補助車等) and anything that can be driven by remote operation (遠隔操作).
Defined inArticle 2, paragraph (1), item (xi)· applies throughout the law
bicyclemachine translation
「自転車」
A vehicle with two or more wheels driven by human power through pedals or hand cranks and not running on rails, other than vehicles for persons with physical disabilities (身体障害者用の車), children's vehicles and walking-aid carts (歩行補助車等); it includes power-assisted ones meeting a Cabinet Office Order (内閣府令) standard, but not small mobility vehicles (移動用小型車) or ones that can be driven by remote operation.
Defined inArticle 2, paragraph (1), item (xi-2)· applies throughout the law
vehicle or streetcarmachine translation
「車両等」
A vehicle (車両) or a streetcar (路面電車).
Short name set inArticle 2, paragraph (1), item (xvii)
drivermachine translation
「運転者」
The person driving a vehicle or streetcar (車両等).
Short name set inArticle 2, paragraph (1), item (xviii)