The A1 merges with the North Circular Road (A406) and the two routes run briefly together, crossing over the Henlys Corner interchange. Henlys Corner is a junction with the 1820s turnpike road, Finchley Road, which was built to provide a by-pass to the route north from London through Hampstead; the name changes to Regents Park Road on the northern, Finchley, side of the junction. The junction had an £8 million upgrade completed in January 2012, which included Britain's first "hands-free" pedestrian crossing to allow Orthodox Jews to reach the nearby Finchley Synagogue, one of Europe's largest, without operating machinery on the Sabbath. While a synagogue has stood on the site since 1935, the current building dates from 1967.