Illinois Highway 159 and Main Street
This checkpoint is in a "blind alley" where Hwy 159 comes through downtown Collinsville and crosses Main Street. There is a traffic light where you must turn right and then straight on Main Street or jog left on 159. Once you reach the point where you must bear right or left you are stuck in traffic and can’t egress due to a median divider and other traffic.
You are then in a funnel with a bank to your left and businesses on the right and the whole block is police performing the roadblock. I have not been stopped in this roadblock as I ride my bike late at night through town and I’ve ridden through the checkpoint as well as sat and video-taped what happens.
I believe their mathematical formula is not consistent because they will allow a long line of cars to proceed while other times stopping every other or so. I’ve seen this begin as early as 8pm and proceed past 11pm. There are usually 6 -8 cars and about 12 officers. There is little warning about this block.