After the Archway roundabout, the A1 enters a cutting, and becomes Archway Road.
The original road north went up the very steep Highgate Hill (now the B519) to the village of Highgate.
By 1808 this was proving unsuitable for increasingly heavy traffic, and a road, crossing the hill through a tunnel at a shallower gradient, was proposed by a mining engineer, Robert Vazie; a turnpike trust – the Highgate Archway Company – was set up and work started in 1810.
The brick built tunnel collapsed during construction on 13 April 1812, and John Nash constructed a brick bridge, using a series of arches like a canal viaduct, to carry Hornsey Lane over what was now a cutting.

Nash's Archway Bridge, a little way south of the current bridge, and the new Archway Road were opened in 1813, though the road surface, being constructed of sand and gravel, proved difficult for heavy traffic.
Parliamentary Commissioners took over the road, and John Benjamin Macneill, chief engineer to Thomas Telford, proposed using Roman cement and gravel, an innovative technique that was used for the first time on Archway Road, and is the basis for modern road building.
The construction was financed by tolls which were abolished in 1876 – traffic increased substantially thereafter, particularly after the introduction of trams on the road.

Between 1897 and 1900, Nash's bridge was replaced with the present cast-iron Hornsey Lane Bridge, designed by Sir Alexander Binnie, accessible from the Archway Road level by a steep flight of steps.
 Hornsey Lane Bridge, designated a Grade II listed building by English Heritage in 1972, is informally called "Suicide Bridge" as it is a known suicide spot.
It was the venue for the mental illness campaign group Mad Pride's inaugural vigil in 2000, and was the subject of Johnny Burke's 2006 film The Bridge.
When, at the end of 2010, three men in three weeks committed suicide by jumping from the bridge, a campaign was set up by local residents for better anti-suicide measures to be put in place.
Hornsey Lane and the bridge marks the boundary between the Inner London Borough of Islington and the Outer London Borough of Haringey.

An inquiry was held into widening the section from the Archway intersection to the Hornsey Lane Bridge to a three lane dual carriageway in 1969 and work started in 1971.
It was originally intended to widen a further section of the road, but severe disruption led to the first inquiry being abandoned in 1978, and a second inquiry in 1984, chaired by Air Marshal Sir Michael Giddings, was also abandoned.
The traffic flow was projected to increase to 180,000 cars a day by 1981, but by 1986 the actual flow was only 30,000 a day.

When originally constructed, Archway Road went through countryside with few buildings - though by 1828 the Woodman pub at the junction with Muswell Hill Road, and the now demolished Wellington pub at the junction with North Hill provided refreshments to travellers; however, with the coming of the railways in 1867 ribbon development started along the road, including the Camra Heritage listed Winchester Tavern with the distinctive attached parade of shops and house with deep arched eaves built by the Imperial Property Investment Co in 1881.
At the northern end of Archway Road, the road re-intersects with the traditional Great North Road route (at this point called North Hill).
The roads almost immediately re-diverge, with the Great North Road route heading north as the A1000 towards Finchley, Whetstone and Barnet and the A1 heading west as Aylmer Road.


Aylmer Road is a very short stretch of road, running west for less than half a mile between the junction with the A1000 in Haringey to the junction with The Bishops Avenue in Barnet.
The entire southern side of the road is taken up by Highgate Golf Course, while the northern side is a mixture of small shops, flats and allotments.
The road is named after Sir Fenton Aylmer, who received the Victoria Cross for his part in the assault on Nilt Fort on 2 December 1891.
After the Archway roundabout, the A1 enters a cutting, and becomes Archway Road. The original road north went up the very steep Highgate Hill (now the B519) to the village of Highgate. By 1808 this was proving unsuitable for increasingly heavy traffic, and a road, crossing the hill through a tunnel at a shallower gradient, was proposed by a mining engineer, Robert Vazie; a turnpike trust – the Highgate Archway Company – was set up and work started in 1810. The brick built tunnel collapsed during construction on 13 April 1812, and John Nash constructed a brick bridge, using a series of arches like a canal viaduct, to carry Hornsey Lane over what was now a cutting.
Nash's Archway Bridge, a little way south of the current bridge, and the new Archway Road were opened in 1813, though the road surface, being constructed of sand and gravel, proved difficult for heavy traffic. Parliamentary Commissioners took over the road, and John Benjamin Macneill, chief engineer to Thomas Telford, proposed using Roman cement and gravel, an innovative technique that was used for the first time on Archway Road, and is the basis for modern road building. The construction was financed by tolls which were abolished in 1876 – traffic increased substantially thereafter, particularly after the introduction of trams on the road.
Between 1897 and 1900, Nash's bridge was replaced with the present cast-iron Hornsey Lane Bridge, designed by Sir Alexander Binnie, accessible from the Archway Road level by a steep flight of steps.  Hornsey Lane Bridge, designated a Grade II listed building by English Heritage in 1972, is informally called "Suicide Bridge" as it is a known suicide spot. It was the venue for the mental illness campaign group Mad Pride's inaugural vigil in 2000, and was the subject of Johnny Burke's 2006 film The Bridge. When, at the end of 2010, three men in three weeks committed suicide by jumping from the bridge, a campaign was set up by local residents for better anti-suicide measures to be put in place. Hornsey Lane and the bridge marks the boundary between the Inner London Borough of Islington and the Outer London Borough of Haringey.
An inquiry was held into widening the section from the Archway intersection to the Hornsey Lane Bridge to a three lane dual carriageway in 1969 and work started in 1971. It was originally intended to widen a further section of the road, but severe disruption led to the first inquiry being abandoned in 1978, and a second inquiry in 1984, chaired by Air Marshal Sir Michael Giddings, was also abandoned. The traffic flow was projected to increase to 180,000 cars a day by 1981, but by 1986 the actual flow was only 30,000 a day.
When originally constructed, Archway Road went through countryside with few buildings - though by 1828 the Woodman pub at the junction with Muswell Hill Road, and the now demolished Wellington pub at the junction with North Hill provided refreshments to travellers; however, with the coming of the railways in 1867 ribbon development started along the road, including the Camra Heritage listed Winchester Tavern with the distinctive attached parade of shops and house with deep arched eaves built by the Imperial Property Investment Co in 1881. At the northern end of Archway Road, the road re-intersects with the traditional Great North Road route (at this point called North Hill). The roads almost immediately re-diverge, with the Great North Road route heading north as the A1000 towards Finchley, Whetstone and Barnet and the A1 heading west as Aylmer Road.

Aylmer Road is a very short stretch of road, running west for less than half a mile between the junction with the A1000 in Haringey to the junction with The Bishops Avenue in Barnet. The entire southern side of the road is taken up by Highgate Golf Course, while the northern side is a mixture of small shops, flats and allotments. The road is named after Sir Fenton Aylmer, who received the Victoria Cross for his part in the assault on Nilt Fort on 2 December 1891.
A1 in London