Emergency vehicle

An emergency vehicle is a vehicle that is used by emergency services to respond to an incident. These vehicles are usually operated by designated agencies which are often part of the government, but also may be non-governmental organizations and commercial companies specifically authorised by law. Emergency vehicles may be exempted from some conventional road rules in order to reach their destinations in the fastest possible time, such as driving through an intersection when the traffic light is red, or exceeding the speed limit. In some states of the United States, however, the driver of an emergency vehicle can still be sued if the driver shows "reckless disregard for the safety of others."
Types.
There are many types of emergency vehicle, dependent on jurisdiction. Some examples of emergency vehicles include:
Equipment.
Many emergency response vehicles (especially those of the main police, fire and ambulance services) are likely to be fitted with audible and visual warning devices, which are designed to facilitate their movement through traffic to reach their destination, and to provide some protection on the scene.
Depending on local laws, vehicles on the road may be required to yield the right of way to emergency responders who are using their warning devices. For example, in Utah, when an emergency vehicle is on the road while using its warning devices, all cars are required to pull over to the side of the road, stop, and wait for the vehicle to pass before resuming normal driving, unless doing so would cause an accident or if stopped at a red light/stop sign. Even in areas where no such laws exist, many motorists may allow the vehicle to pass as a matter of courtesy.
Summoning assistance.
In many countries, emergency vehicles are usually dispatched from a center that takes calls from an emergency telephone number, such as 9-1-1, 999, 1-1-1 or 1-1-2.
Livery.
Colour and design choices reflect several needs, but typically may include: