Ontario Bus Driver Knowledge Practice Test

School buses must stop at least 5 metres from the nearest rail at railway crossings. This distance is recommended to ensure the safety of students and to give the bus enough space to stop in case of an emergency. Option A is incorrect because 3 metres is not a sufficient distance to ensure safety. Option B is incorrect because 10 metres is not the recommended distance. Option D is incorrect because 15 metres is much farther than the recommended distance. Therefore, the correct answer is C.