A level crossing, also known as a grade crossing, is an intersection where a railway line and a road meet each other on the same level. This means that the grades (the road and the track) are not separated by using a bridge or a tunnel. Level crossings can also be found where a light rail line with separate right-of-way or reserved track crosses a road in the same fashion. Depending on how much traffic there is, there are different measures to make the crossing more secure, such as signs or panels indicating the crossing, blinking or steady lights, sounds (usually a warning bell), and gates/barriers that are lowered before a train passes. Level crossings can be dangerous, and there have been many accidents, so they are usually grade separated once there is more traffic or high-speed trains.