Unless the following paragraph applies, it is prohibited for the driver of either a vehicle or streetcar, these being classed separately as set forth in each of the following items, to obstruct the progress of another vehicle or streetcar as set forth in the item at an uncontrolled intersection:
a vehicle must not obstruct the progress of:vehicles approaching from the left on a road intersecting the road on which the vehicle is proceeding (hereinafter referred to as an "intersecting road") and streetcars proceeding down an intersecting road;
a streetcar must not obstruct the progress of:streetcars approaching from the left on an intersecting road.
At an uncontrolled intersection, a vehicle or streetcar must not obstruct the progress of other vehicles and streetcars traveling on an intersecting road that constitutes a priority road (meaning a road designated as such by road signs or markings, or a road at whose intersections a center line or vehicle traffic lanes have been established by road signs or markings in order to regulate the movement of vehicles on the road; the same applies hereinafter) or of other vehicles and streetcars traveling on an intersecting road that is clearly wider than the road on which the first vehicle or streetcar is traveling, unless the road on which the first vehicle or streetcar is traveling is also a priority road.
Before entering an uncontrolled intersection, the driver of a vehicle or streetcar (other than a vehicle or streetcar traveling on a priority road) must drive at reduced speed if the intersecting road is a priority road or is clearly wider than the road on which that vehicle or streetcar is proceeding.
Before entering an intersection and when traveling through it, the driver of a vehicle or streetcar must pay particular attention to vehicles and streetcars traveling on intersecting roads, vehicles and streetcars approaching from the opposite direction and turning right, and pedestrians crossing the road at or in the immediate vicinity of the intersection, and must proceed at the safest possible speed and in the safest possible manner, in keeping with the conditions at the intersection.