state and US Highway designations within the Interstate 465 beltway, either truncating the highway at the beltway (U.S. Highway 136), deleting the highway altogether (Indiana State Road 100), or diverting the routes onto the beltway. A decommissioned route may also find other use besides automobile use. The Abandoned Pennsylvania Turnpike, a bypassed section of the Pennsylvania Turnpike that features two vehicle tunnels that were overcapacity after the Turnpike saw a surge in usage after World War II, is perhaps the most notable example of this, as it has since become a bike and pedestrian trail and, due to using the alignment for the stillborn South Pennsylvania Railroad, is also unofficially a rail trail. Even as superhighways supplant older surface routes, some historical highways get attention from those with antiquarian (and commercial) interests in the continued recognition of such routes. US 66 in the midwestern and southwestern United States is a prime example of such efforts; "Historic Route US 66" markers, completely unofficial, designate most of the old surface road, some of which has literary significance (as in John Steinbeck's novel The Grapes of Wrath). Canada Many of Quebec's Autoroutes supplant old through routes. In New Brunswick, when a bypass road or freeway is constructed, it normally takes the number of the road it replaced, often removing portions of the old road from the provincial highway system entirely. Most become local or county roads; in some cases (such as the Moncton-Fredericton Highway 2, bypassed as freeway in 2001) a section of the old road would be retained as part of some other provincial highway because it reaches a major town the new road had bypassed. In 1997 and 1998, the province of Ontario undertook a major highway decommissioning project, dropping over of road from the provincially maintained highway system. Most of the former highways are now numbered as county roads. See also List of former provincial highways in Ontario. The Thousand Islands Parkway in Ontario was originally four lanes and part of Ontario Highway 401, Canada's busiest highway, before 401 traffic was bypassed inland on completion of that freeway in 1968. Two of the lanes are provincially maintained for automobile traffic by the St. Lawrence Parks Commission but the other pair have been replaced with footpaths and a bicycle trail. Europe In Germany, many Autobahns supplant an older through route, as in Bundesstraße 60 (best translated as Federal Highway 60), which