All cars must be equipped with a fire extinguisher which operates in the cockpit and engine compartment. It must be operable by the driver seating normally in the cockpit with his seat belts on and must work even when the main power circuit of the car fails or the car is inverted.
There must to be a switch for fire extinguishing system activation outside the cockpit. Its location on the car must be marked on the car’s body by a red letter “E” within the white circle.
All cars must have a switch in the cockpit which the driver can use to cut all main electrical circuits. It must be marked on the steering wheel with red spark in a blue triangle within a white border. There must be an additional switch which marshals on the track can activate remotely using a special hook. It is located below the main roll-over structure.
All cars must have two mirrors whose size and location must meet the strict requirements. While sitting in the car, drivers must prove functionality of the mirrors to the FIA by reading letters and numbers on special board located at different distances behind the car.
Seat belts are mandatory in Formula 1. Drivers must wear two straps over shoulders, one on the abdomen and two between legs. All must comply with strictly specified FIA standards.
All cars must have a red light on the rear in a specific location defined by FIA. The driver must be able to switch the light on at any time, usually in poor weather to make the car more visible.
The cockpit of the car must have special three-sided padding to protect the driver’s head. U-shaped padding protect driver’s head from behind and from sides and driver has to remove the padding before getting out of the cockpit.
Similiar protective padding has to be wrapped above and around sides of drivers’ legs to minimise risk from injuries during an accident.
To easily extract a driver from a car in the event of an accident the seat must be removable together with a driver and his seatbelts fastened. The seat must be secured with a maximum of two belts which can be released using a standard tools issued to all rescue crews.
FIA F1 2017. Technical Regulations can be downloaded here.