If planning to stop on the road to unload cargo, you should:

Question

You should tap your brakes and flash your brake lights to warn other drivers any time you plan to slow or stop where other drivers may not expect you to do so. Use this technique when stopping on the road to unload cargo or passengers.

Accepted Answer

Warn other drivers by tapping your brakes.

Answer

Stop suddenly, since you are already on the road.

Answer

Wave your arm out the window to get the attention of other drivers.