West of Albion Road, Steeles continues into Peel Region, where it is also known as Peel Regional Road 15. It runs through Brampton and into the Halton Region town of Milton. It stops at Appleby Line on top of the Niagara Escarpment due to the Crawford Lake Conservation Area being there, and then the road starts again just east of Guelph Line and goes until the Milborough Townline on the border of Milton and Hamilton. East of the Toronto-Pickering border, it becomes Taunton Road.