1. Deal with danger
Further collisions and fire are the main dangers following an accident. Approach any vehicle involved with care. Switch off all engines and, if possible, warn other traffic. Stop anyone from smoking.
2. Get help
Try to get the assistance of bystanders. Get someone to call the appropriate emergency services as soon as possible. They will need to know the exact location of the accident and the number of vehicles involved.
3. Help those involved
DO NOT move casualties still in vehicles unless further danger is threatening. DO NOT remove a motorcyclist's helmet unless it is essential. DO NOT give the casualty anything to eat or drink. DO try to make them comfortable and prevent them from getting cold, but avoid unnecessary movement. DO give reassurance confidently to the casualty. They may be shocked but prompt treatment will minimise this.
4. Provide emergency care
Follow the ABC of first aid
A if for Airway - check for and relieve any obstruction to breathing. Remove any obvious obstruction in the mouth. Breathing may begin and colour improve.
B if for Breathing - if breathing does not begin when the airway has been cleared, lift the chin and tilt the head very gently backwards. Pinch the casualty's nostrils and blow into the mouth until the chest rises; withdraw, then repeat regularly once every four seconds until the casualty can breathe unaided.
C if for Circulation - prevent blood loss to maintain circulation. If bleeding is present apply firm hand pressure over the wound, preferably using some clean material, without pressing on any foreign body in the wound. Secure a pad with a bandage or length of cloth. Raise the limb to lessen the bleeding, providing it is not broken.
5. Be prepared
Always carry a first aid kit. You could save a life by learning emergency aid and first aid from a qualified organisation, such as the local ambulance services, the St John Ambulance Association and Brigade, St Andrew's Ambulance Association, the British Red Cross or any suitable qualified body.