Illinois State Police and Cook county Sheriff’s Department stake out a break in the retaining wall between east and west bound Interstate 90, also known as the Northwest Tollway. The break in the retaining wall is used for emergency and authorized vehicles to make U-turns, oh and also for speedtraps. I travel east bound on I-90 five to six nights a week and see someone pulled over three to four times a week. Look for the sign that says "No U-turns except for authority vehicles." Police also stake out a smilar location at mile marker 15.5, but not as often.