After you have passed another vehicle, when is it safe to return to your lane?

The correct choice emphasizes the importance of ensuring a safe distance between your vehicle and the vehicle you have just passed before returning to your lane. This is vital for several reasons. First, it allows enough space for both vehicles to avoid any potential accidents, particularly if the vehicle being passed accelerates or if there are sudden changes in traffic conditions.

Returning to your lane immediately after passing can be risky, especially if the vehicle you overtook has not yet fully dropped back, leading to a possible collision. Relying on just the visibility of the vehicle in the rearview mirror may not account for factors such as the speed of both vehicles. The presence of a solid line is related to road markings and does not pertain to the specific conditions under which it is safe to change lanes after overtaking a vehicle.

Thus, the correct response highlights the necessity of assessing your safety and that of other road users, reinforcing safe driving practices.