1 n. — Saskatchewan, Transportation, Automotive
a road built on a road allowance laid out by the original Dominion Land Survey.
Type: 1. Origin — The prairie provinces were surveyed as they entered Canada, starting in 1871. The survey laid out road allowances in a regular grid, "two miles apart from north to south and one mile from east to west" ("grid road", Gage-1).
See also Gage-1, s.v. "grid road", which is marked "Cdn.", ITP Nelson, s.v. "grid road", COD-2 labels the meaning "Sask.".
See also: correction line grid (road) system road allowance
2 n. — especially Saskatchewan, Transportation
a road network that runs along a grid system.
Type: 5. Frequency — The expression is most frequently used in Canada (see Chart 1), which mostly stems for its use on the Prairies, especially in Saskatchewan. However, outside the prairie provinces, the grids are of varying sizes and date from many periods.
See COD-2, which marks the meaning as "Cdn".
Images:

Chart 1: Internet Domain Search, 13 Aug. 2012 
Chart 2: Regiona Domain Search, 21 Sep. 2012