In which situation is lane splitting least likely to be safe?

Lane splitting is least likely to be safe in heavy traffic due to the unpredictability and reduced visibility in crowded conditions. When traffic is heavy, vehicles may be moving slowly or may stop suddenly, increasing the risk of collisions for motorcyclists who are attempting to maneuver between lanes. Additionally, drivers in larger vehicles, such as trucks and cars, may be less aware of motorcycles in their blind spots or may not expect a motorcycle to be traveling between lanes. This creates a heightened risk of accidents as motorists focus on navigating through the congestion rather than detecting other vehicles near them.

In contrast, situations like sunny days or wide lanes might provide favorable conditions for lane splitting, and clear roads are generally safer as there are fewer obstacles and less chance of sudden movements from other vehicles.