New detailed map of the CVT was recently posted by the Friends of the Chester Valley Trail.
Parking or Where do I Access the Trail?
This map shows the dedicated parking locations for trail users. Unfortunately only one parking location is available in Tredyffrin. This lot is in the Westlakes office park off of 252. Another location with easy access to the trail is the playing fields off Cedar Hollow Road on the south side of 202. For those in the eastern end of the township a lot is available off Warner Road on the Montgomery County section of the trail.
The map does show where rest rooms or toilets are available. Unfortunately no facilities besides portable toilets are available in Tredyffrin. Your best locations are Target and Wegmans or the facilities available in East and West Whiteland.
If you are a biker, runner, or walker; you should try out the CVT.