Slow-downs coming on Oshawa streets Posted on February 2, 2021 by oshawaexpress in CITY, NEWS Grand Ridge Avenue (Google image) By Courtney Bachar/The Oshawa Express/LJI Reporter Speed reductions are coming to a couple of streets across the city. Council recently approved a speed reduction to 40 km/h from 50 km/h on a portion of Grand Ridge Avenue. According to a city report, Grand Ridge Avenue is a dead-end street, which runs west from Harmony Road North for about 500 metres. The first 120 metres is posted at 50 km/h before reducing down to 40 km/h approaching St. Joseph Catholic School and Grand Ridge Park.