There are many different sized busses, but the normal size is 35 feet long and 8 to 9 feet wide with a seating capacity of about 72 passengers. The seats are about 39 inches wide with 3 students per seat. School busses are painted a special shade of yellow known as National School Bus Glossy Yellow with black lettering. Why? Scientists have unanimously concluded that yellow tends to stand out the most in any situation, an important fact considering the usual times students a picked up and dropped off. Busses are usually equipped with a first aid kit, a fire extinguisher, a seatbelt cutter, and a two-way radio for communication. Also, busses are equipped with yellow and red flashing lights. When the yellow lights flash it means the bus is getting ready to stop. When the red lights flash drivers approaching from both directions must stop to allow the children to get on or off the bus safely. Drivers may not proceed until the bus begins moving or the red lights are shut off.