Apa Tu????

I'm asking a lot of people most of them also cannot give me the answer. I even asked my friends who are the car sell man he also don't know. Why there is a contact number spread on behind the lorry, pickup, truck and some other big vehicle? And the contact number are all the same one. That contact number belong who one.. I don't know lah but some say that number is belong to the Land Transport Department hot line. I not so sure this is firm information or not lah they say you can call the number to complaint the vehicle having a aggressive diver on the road something like that lah.
If anyone of you knowing what is this all about with the contact number spread behind there please share it with us here. Thanks!