Caution lighting Heavy Vehicles
When heavy vehicles are going up hills or slops that causes the vehicle to loose speed a light then flashes behind the last trailer in the direction of the approaching vehicles from behind the light would come on when the vehicle speed goes down below 40 or 50 kms the light should be a heligen green or blue so to make it a colour the could relate to this situation
why I suggest this is I have witnessed many accidents where cars and trucks have ran up the rear of slow moving heavy vehicles and as the gross weight of these vehicles are now approching 80 tones it is time that more caution is bought into the industry.
Ian Hargreaves. This idea was put up for a financial outcome .