Steeles Avenue is an east–west street that forms the northern city limit of Toronto and the southern limit of York Region in Ontario, Canada. It stretches across the western and central Greater Toronto Area from Appleby Line in Milton in the west to the Toronto-Pickering city limits in the east, where it continues east into Durham Region as Taunton Road, which itself extends across the length of Durham Region to its boundary with Northumberland County. York Region refers to Steeles Avenue as Regional Road 95 but the designation is strictly internal and there are no signs posted; as the street was always owned and maintained by the City of Toronto (succeeding Metropolitan Toronto). Through Peel and Halton Regions, the street is signed as Peel Road 15 and Halton Road 8, respectively. The combination of Steeles and Taunton Road is the only arterial road to cross almost the entire Greater Toronto Area without breaks or turnoffs. History The street is named after Thomas Steele (1806-1877), the first proprietor of the Green Bush Inn on the northwest corner of the street's intersection with Yonge Street in Thornhill. Thomas Steele also previously managed an Inn in Bond Head, Ontario. The street's name originally contained an apostrophe (before the 'S'), a suggestive of Steele's possession of the inn and land around the intersection, but it was dropped by the mid-20th century. Steeles in Scarborough was once referred to as Scarborough Town Line from 1850 to 1953. The section west of Yonge (bordering Vaughan) was called Vaughan Town Line. Prior to 1967, Steeles Avenue was named Upper Base Line (Lower Base Line being Eglinton Avenue, which is still named as such) in Halton County. Steeles became a division boundary in 1953 when the road, which was a common township boundary across the width of the-then York County between the more urban townships surrounding the old City of Toronto and the more rural ones farther north, was chosen as the northern boundary of the new Metropolitan Toronto, which was severed from the county that year. To the west in Peel County, it was also the southern boundary of Chinguacousy Township and the Town of Brampton and the northern boundary of Toronto Township (later the Town of Mississauga between 1968 and 1974) until the municipal restructuring of 1974 brought Steeles fully within Brampton when the new city limits were set to the south at the-then future Highway