Cops sit at the foot of the Hickory Overpass, in Lasalle Park’s parking lot off of Airline & David Dr with their radar gun pointed at the top of the bridge. Once you see them its to late. There are usually 3 state troopers 1 with the radar and 2 writing, you guessed it " your very own ticket". The speed limit is 40 MPH. Remember its not how fast you have to go to get up the bridge, its how fast they clock you at..