When is it appropriate to finish passing a vehicle?

Finishing a pass before reaching a solid double line is the correct principle because solid double lines indicate that passing is prohibited in that area. The presence of a solid double line signifies that the road ahead is not safe for overtaking another vehicle, and passing in this zone could lead to dangerous situations, including head-on collisions.

While factors such as signaling and the absence of oncoming traffic are important for safe driving, they do not override the rule commanded by the road markings. It is vital to respect road signs and markings to maintain safety for all road users. Thus, completing a pass before reaching that solid double line ensures compliance with traffic laws and promotes safer travel.