Highways and roads, the most important asset, accounted for 57% of total public infrastructure stock in Ontario in 2007. Many years of strong investments after 1994 have lowered the average age of the province's road network from 16.8 to 13.9 years. This is approaching the historic low of 13.3 years last seen in 1973.
In 2007, Ontario drivers, along with those of Prince Edward Island, enjoyed the youngest road network in the nation. As a percentage of estimated useful life, Ontario rate has tended to track very closely with the national average in most years. However, a somewhat larger gap has opened up in favour of Ontario in recent years. In 2007, roads in Ontario had passed only 49% of their estimated useful life, compared with a national average of 53%.