RV621 from Harristown make an awful loud whining noise when it pulls away, it seems as if its trying to take off faster than it can, and that the engine is being pressured too much, but then when it does take off it jumps to a sort of shot like a jolt and the whine noise starts to fade away, however still loud.
The Bus Eireann VR's have a switch on the dash which when you push it it makes a loud piercing siren noise and the hazzard lights start flashing. It is the panic alarm. The DD's also have one, but it is on the floor, beside your left foot. You have to kick it to turn it on and off,