The construction of Highway 410 resulted in changes to the surrounding street network: The intact southern section of Heart Lake Road south of Steeles Avenue was severed from the northern section after the highway largely subsumed the latter. This portion was renamed Tomken Road (as a continuation of a street linked to its southern terminus when a jog was eliminated), and a diversion was constructed by the City of Brampton to connect it with Steeles further east. The West Drive Extension, between Orenda Road and Steeles, was constructed in 1983 to link with the north end of the new diversion.