You are riding a motorcycle. What danger should you expect when passing an oncoming bus?

This question is about the danger when passing an oncoming bus, that is a bus coming towards you from the opposite direction. You expect a gust of wind first towards the right edge of the road and then towards its middle - answer C.

The Road Traffic Act requires you to keep a safe lateral clearance when passing an oncoming vehicle and, if necessary, to move to the right, and on a motorcycle the physics of air also comes into play. A large vehicle pushes a wave of compressed air in front of it: when its front passes you, this wave hits the motorcycle and pushes it to the right, towards the edge of the road. Immediately after that, along the side and the rear of the bus, an area of low pressure and turbulence forms, which pulls the motorcycle to the left, towards the middle of the road. Two opposite jolts within a second can easily throw you off your line, especially on a light motorcycle at high speed. Answer B reverses the order, and answer A does not describe any effect that occurs when passing an oncoming vehicle. Before the bus comes close, you keep to the right part of the lane with some space from the edge, grip the handlebars firmly, press your knees against the tank and do not perform any manoeuvres at that time.

Legal basis: Art. 23 para. 1 point 1 and Art. 19 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)