Quebec Autoroute 31
|Maintained by Transports Québec|
|Length:||14.0 km (8.7 mi)|
|Existed:||1966 – present|
|South end:||Autoroute 40 in Lavaltrie|
|North end:||Route 158 in Joliette|
|Major cities:||Lavaltrie, Joliette|
Autoroute 31 (A-31) is an Autoroute in the region of Lanaudière in Quebec. Constructed in 1966, the A-31 primarily links Joliette with the A-40 and in turn to Montreal, Trois-Rivières, and other points served by Quebec's autoroute system. The A-31 is only 14 km (8.7 mi) long, making it one of the shortest autoroutes in the province. It is multiplexed with Route 131 for its entire length.
The A-31 begins just south of its interchange with A-40 in Lavaltrie. Motorists exiting the A-40 can opt to travel north on A-31 (multiplexed with Route 131) or south on Route 131 to Lavaltrie's city centre. The A-31/A-40 interchange has an unusual configuration, built to accommodate tollbooths (since dismantled). Also unusual for a Quebec autoroute: agricultural vehicles like tractors are permitted to cross over the A-40 by travelling on A-31 from its southern terminus to exit 2. For this reason, an automated traffic regulation system (commissioned in 2009) lowers the speed limit automatically from 100/60 km/h to 90/30 km/h as needed.
Exits at km 2 and km 7 provide access to local roads, while a partial interchange at km 12 serves an industrial zone south of Joliette.
The A-31 ends at km 15 at a cloverleaf interchange with Route 158. Plans for Quebec's autoroute system initially called for A-31 to meet the A-50 at this interchange. Anticipating this outcome, Route 158 in the immediate vicinity of the interchange was constructed as a limited-access highway and signed as A-50. Once plans to extend the A-50 east of the A-15 were abandoned in the 1980s, this stretch of highway was redesignated Route 158.
Motorists exiting the A-31 at km 15 may continue on Route 158 west to St-Esprit, Route 158 east to Berthierville, or Route 131 north to Saint-Félix-de-Valois. Past this interchange, A-31 ends and becomes Boulevard Dollard, which continues into downtown Joliette.
|RCM or ET||Municipality||km||No.||Destinations||Notes|
|Continues as Route 131 to Lavaltrie|
|D'Autray||Lavaltrie||0||A-40 east – Quebec City||at-grade intersection, South end of Route 131 overlap|
|1||A-40 west / Rang Saint-François – Montreal|
|1||2||Rang Saint-Henri, Rang du Point-du-Jour|
|Joliette||13||14-E||Route 131 north / Route 158 east – Saint-Félix-de-Valois, Berthierville||North end of Route 131 overlap|
|14-O||Route 158 west – Saint-Jérôme|
|Continues as Boulevard Dollard to Downtown Joliette|
- "Répertoire des autoroutes du Québec" (in French). Transports Québec. Retrieved 2008-02-23.
- Ministère des transports, "Distances routières", page (?), Les Publications du Québec, 2005
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