They sit in main entrance to cemetery in early morning hours. There are many tall trees, along with monuments, with no lighting in cemetery which makes it near impossible to see them. They sit well back monitoring with radar. Speed limit is 40mph as you travel past Salt Creek going south and then suddenly a sign appears on the west side adjacent to the forest preserve with branches hanging out indicating a speed limit of 35mph. Then about an 1/8 of a mile from 31st it goes down to 30mph.