Cat eyes....or not?

I was driving today on Sharah-e-Faisal, the main artery which connects Karachi's several towns and is the most likely road you will travel going to just about anywhere. Khair, i was driving and i indicated to switch lanes and then suddenly i heard these horrible sounds like someone was hammering away on the underside of my car. After i had switched lanes successfully the sounds stopped and then i realized that these sounds had been caused by the cats eye dividers that have been put in place, these things are the size of a cat and are placed every 2 feet away. Now i failed to understand the importance of these things uptill now when i got to the office and have started hearing new mysterious sounds coming from my car. The conclusion that i derived at was that this was a conspiracy by the car manufacturers and the government to increase the wear and tear on the common mans cars so that he/she may change their cars more often and result in revenues for the car makers and taxes for the government The reason being that no sane person would put these huge pieces of metal on roads where cars travel in excess of 80km/h.What were the people with the city government thinking?!!!!!!!!