Pennsylvania Route Marker (M1-6)
The Pennsylvania Route
Marker shall be authorized for use to mark Pennsylvania traffic routes.
standard size of M1-6 shall be 24-inches by 24-inches for one and two
digit route numbers and the 30-inches by 24-inches for three digit route
numbers. The 36-inch by 36-inch size for one and two digit route
numbers and the 45-inch by 36-inch size for three digit route numbers may
be used on expressways. Pennsylvania uses the state symbol, the
Keystone, for highway marker background. The Pennsylvania Turnpike
Commission uses green on white keystones with "PA TURNPIKE" at
the top on the Amos K. Hutchinson Bypass/PA 66 and the Mon-Fayette
Expressway/PA 43. Standard markers with "TOLL" at the top
are still used on the James E. Ross Highway/PA 60, and were used on the
other two expressways before being replaced because the "toll"
connotation made drivers resist using the expressway according to the