Leaving Concord Center heading east toward Boston, you will fork right onto Cambridge Turnpike, a fairly narrow two-lane road that leads to a light at Route 2. On the straightaway, drivers typically will hit 50mph, which will feel perfectly reasonable. The limits are mostly 35mph, and traps are often in place in the garden store lot (on the left heading east) or at the Sandy Pond Road intersection) on the right heading east after the straightaway. Watch for post rush hours and later at night.