Standard-Thomson Corporation, 152 Grove St., Waltham

From Route 128 take Route 20 East through Waltham Center over a metal bridge. After the first light, turn right onto Willow St., and at the next light, turn left onto Grove St to 152 Grove St. OR from Watertown Square, take Route 20 West to Waltham, turn left at Shell station onto Gore St., right to 152 Grove St. Enter driveway, go past the guardbooth; class is in building on the right, parking on the left.