Well prices can be high on these locations as it is normal all over the world if you talk about particularly airports.. But highways.. Well ok lets say its ok but the question here is they are not following the price list " narkh nama"... Actually no one bother to check.. And they are making money out of it..
Here in USA even a small grocery store should reflect a certificate on his counter front showing the current valid status of weighing machine. It has to be checked and calibrated every few months via a independent service.