Incorrect!

A collision has just happened. An injured person is lying in a busy road. What's the first thing you should do?

Treat the person for shock
Warn other traffic
Correct answer
Place them in the recovery position
Make sure the injured person is kept warm
You selected this answer

DVSA theory test explanation

The most immediate danger is further collisions and fire. You could warn other traffic by switching on hazard warning lights, displaying an advance warning triangle or sign (but not on a motorway), or by any other means that does not put you or others at risk.