Left image: It is a truck travelling at 80km/h in a 130km/h zone
Right image: They are two trucks travelling at 80km/h and 81km/h respectively in a 130km/h zone
The images are funny since even though the speed limit in the zone is 130km/h, a truck travelling at 81 km/h decides to overtake another travelling 80km/h. The faster truck is barely faster and takes a long time to overtake causing other faster road users to get annoyed.