The Highway Police in Jordan

My taxi driver, Mohammad, was taking me from Amman to Petra along the King’s Highway in a yellow cab. We were cruising at a safe and relaxed speed of ~90 km/h (110 km/h allowed). Suddenly a police officer jumped on the road and stopped us. The driver had to get out of the car and the police officer asked how fast we were going. He said “90”. Then the police officer said (in Arabic): “you were speeding; only 80 is allowed here”. Of course my driver replied that 110 is allowed and we even just passed such a road sign. The police officer explained that at this particular stretch only 80 was allowed!!??? The fine was 30 euros (which is a lot of money in Jordan).
Afraid of getting “caught” again we continued at around ~85 km/h. And amazingly about 10 minutes later our yellow cab was pulled over again (while other, much faster and bigger cars were allowed to pass), and, yes we got another fine of 30 euros… what did we learn? next time do not take a yellow cab... looks too touristic... and tourists have money...