Southern Terminus:  Pre-1998: Port Stanly Ontario

                                         Current: Junction King's Highway 3 in Talbotville (near St. Thomas)

Eastern / Northern Terminus:  Pre-1998: Junction King's Highway 24 just south of Singhampton

                                                            Current: Junction King's Highway 8 in Clinton

Length:  Pre-1998: 275.6 km.  Current: 100.8 km.

Multiplexes: Presently none. Before downloading there was an 8.4 km multiplex with Highway 2, and a 13.4 km multiplex with Highway 9.  (Both very historic multiplexes)

Freeway:  No

AADT (2002):  Highest: 14,700, from Southminster Bourne to Highway 401;

                             Lowest:  3,800, from Huron Road 12 to Clinton South Limits.

Road Info:  Highway 4 is in good shape for its entire current length (with the exception of the connecting link in London).  Between Clinton and Exeter Highway 4 is built to an older standard which I found made for an enjoyable trip.  Travelers should be wary of the communities of Exeter and London, these communities can be quite congested at peak traffic times.