Exit 312 / Downingtown, formerly Exit 23
Route 100 South
At second light, turn left 
Proceed approximately .5 miles
Turn left onto Gordon Drive
Pass the first parking lot on right
Turn right into second parking area
Principia is on the right, Suite 604

Interstate I-95 South
Right exit onto Route 322 West, for approximately 5 miles
Left onto Route 1 South, for approximately 1 mile
Right onto Route 100 / 202 North, for approximately 5 miles
Exit Right onto Route 100 North
Cross Route 30 at large intersection, straight for approximately 2 miles
Right onto Gordon Drive
Straight to first light
Straight across intersection
Pass the first parking lot on right
Turn right into second parking area
Principia is on the right, Suite 604

South on Route 202
West on Route 30
Exit right at Route 100
Route 100 North
Cross Route 30 at large intersection, straight for approximately 2 miles
Right onto Gordon Drive
Straight to first light
Straight across intersection
Pass the first parking lot on right
Turn right into second parking area
Principia is on the right, Suite 604

East on Route 30, or follow directions for Pennsylvania Turnpike (above)
Exit Route 30 Bypass onto Route 100 / Exton
Left onto Route 100 North
Cross Route 30 at large intersection, straight for approximately 2 miles
Right onto Gordon Drive
Right onto Pickering Way
Right into parking lot
Principia on the second floor, Suite 200

Cross at Delaware Memorial Bridge onto Route 95 North
Just north of Wilmington, DE, exit Route 100 / 202 North
Follow Route 100 / 202 straight for approximately 15 miles
Exit Right on Route 100 North, straight for approximately 3 miles
Cross Route 30 at large intersection, straight for approximately 2 miles
Right onto Gordon Drive
Straight to first light
Straight across intersection
Pass the first parking lot on right
Turn right into second parking area
Principia is on the right, Suite 604