Editing Macadam (section)

===North America===
The first macadam road built in the United States was constructed between [[Hagerstown, Maryland|Hagerstown]] and [[Boonsboro, Maryland]], and was named at the time Boonsborough [[Toll road|Turnpike]] Road. This was the last section of unimproved road between [[Baltimore]] on the [[Chesapeake Bay]] to [[Wheeling, West Virginia|Wheeling]] on the [[Ohio River]]. Before it was macadamized, stagecoaches travelling the Hagerstown to Boonsboro road in the winter had taken 5 to 7 hours to cover the {{convert|10|mi|adj=on}} stretch.<ref name=ElectricScotland>{{citation |title=John Loudon MacAdam |work=Significant Scots |publisher=ElectricScotland.com |url= https://www.electricscotland.com/history/other/macadam_john.htm |access-date=2017-02-13}}</ref><ref name=curbstone>{{cite web |url=https://curbstone.com/_macadam.htm |title=1823 – First American Macadam Road |access-date=2017-02-13 |archive-url=https://web.archive.org/web/20201127012227/https://curbstone.com/_macadam.htm |archive-date=27 November 2020 |url-status=dead}}</ref> 

This road was completed in 1823, using McAdam's road techniques, except that the finished road was compacted with a cast iron roller instead of relying on road traffic for compaction.<ref>{{cite web |url=http://www.town.boonsboro.md.us/index.asp?SEC=E4DE0ECB-A02E-4603-8279-BAF21E62BC37 |title=The History of Boonsboro |access-date=2017-02-13}}</ref> The second American road built using McAdam principles was the [[National Road|Cumberland Road]] which was {{convert|73|mi}} long and was completed in 1830 after five years of work.<ref name=ElectricScotland/><ref name=curbstone/>