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 . After breaking at Appleby Line atop the Niagara Escarpment due to the presence of the Crawford Lake Conservation Area , the road resumes just east of Guelph Line and continues until the Milborough Townline on the boundary between Milton and Hamilton .