the speed limit at the 4600 block of Randolph rd (Montgomery County, Md) is 35mph. but as you get to this point, from the west, the number of lanes has increased (from 2 to 3 eastbound) and a median divider begins; this makes many drivers think, based on their driving experience, that they are beginning to drive on an expressway or quasi expressway and those typically have speed limits of 45 mph or greater