For road safety and explicitly showing possible dangers in emergency situations, tanker trucks and containers are marked with dangerous goods signs to inform about possible risks. The orange signs show the Kemler Code (hazard identification)on the top row and on the bottom row the UN substance identification number. Trucks may also carry empty signs to indicate cleaned containers of multiple different substances.
Q-Free provides software for extremely accurate automatic detection and identification of Dangerous Goods signs. The software finds and reads the orange two-line signs in an image. For each sign, it returns the Kemler Code and UN-Number. It furthermore reports on the detected empty dangerous goods signs.