How do you find the nearest motorway emergency phone?

Marker posts on the motorway often have arrows and signs indicating the direction to the nearest emergency phone. This is important in case of an emergency where you may not have phone signal or your mobile phone's battery has died. Calling 999 may not be the best option as it can cause delays in getting help, and waiting for a patrol officer may also not be the fastest option in emergency situations. Therefore, following the marker post directions is the most efficient way to find the nearest motorway emergency phone.