Be very careful when driving through Concord and the Charlotte area on I-85. There are many "Work Zones" where the speed limit drops from 65 MPH to 55 MPH. The "Work Zone" around Exits 46-49 is initially poorly marked and NC State Troopers park next to the "Work Zone" speed limit signs firing their radar especially on those in the left hand lane. Enforcement by NC State Troopers is so vigilant I would strongly recommend never exceeding 60 MPH at night in North Carolina especially if you have out of state plates. At night you can miss reduced speed signs so easily especially when there are many trucks travelling the interstate along with you. So go slow in North Carolina the fines are very high and there is strict enforcement.