Official UAE guidance is to phone the police on 999 after a road accident, give your location and follow their instructions. If nobody is injured, the cars can be moved to the shoulder so traffic keeps flowing, and you should wait at least 15 metres from your vehicle.
If someone is hurt, leave every vehicle exactly where it is until help arrives. Dubai Police also stress that the hard shoulder is for genuine emergencies, so after a minor bump on a motorway it is better to take the next exit before checking the damage.