Correct, it has been proven many times that the lack of blindspot directly in front of the vehicle (to the driver) is the main factor. New "stubby" nose school

Correct, it has been proven many times that the lack of blindspot directly in front of the vehicle (to the driver) is the main factor. New "stubby" nose school bus designs greatly improved this over existing ones which were closer to a semi. Lately, front cameras and warning systems have made this less of a concern but it still remains the case.