The correct answer is A. Channelization of pavement is caused by constant use of tri-cycle gears of aircraft.
Channelization of pavement is caused by the following:
- The weight of the aircraft
- The pressure of the tires
- The friction between the tires and the pavement
- The water on the pavement
The tri-cycle gear of an aircraft is a type of landing gear that has two main wheels and a nose wheel. The main wheels are located near the center of the aircraft, and the nose wheel is located at the front of the aircraft. The tri-cycle gear is designed to provide stability and control during takeoff and landing.
The tri-cycle gear does not cause channelization of pavement. Channelization of pavement is caused by the factors listed above.
Blast pads are used over cohesion-less soils to resist erosion due to tremendous speed of the jet blast.
Over-run areas of at least 300 m length on either side of the runway are provided to allow aircraft to come to a safe stop in case of an emergency.