| Route 340 | ||||
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| Route information | ||||
| Maintained by Transports Québec | ||||
| Length: | 40.2 km (25.0 mi) | |||
| Major junctions | ||||
| West end: | County Road 18 at South Glengarry, Ontario | |||
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| Location | ||||
| Counties: | Vaudreuil-Soulanges | |||
| Highway system | ||||
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Route 340 is a provincial highway situated in the Montérégie region of Quebec west of Montreal. It runs for just over 40 kilometers from the Ontario-Quebec border in Saint-Télesphore (as a continuation of Stormont, Dundas and Glengarry County Road 18) and ends in Vaudreuil-Dorion at the junction of Autoroute 20.