The A1170 follows part of the original, pre-bypass route of the A10 in east Hertfordshire.
Roundabout on the A1170, Ware
The road starts at the Moles Interchange, a modern dumbbell GSJ between Thunbridge and Ware, where the current route of the A10 crosses its original route. The old road to into Thunbridge is now unclassified and the A1170 heads southwards into Ware. Although the urban area starts almost immediately, the road remains semi-rural for some distance as it passes a leisure centre before continuing down a leafy lane between two housing estates - and even when the road is lined with houses they are not immediately accessible from it. The road finally becomes definitely urban just before a roundabout with the B1001 (Charvilles Roundabout), after which the road bears to the left to run along Ware High Street.
At the mini-roundabout at the eastern end of the High Street the road bears right to cross the D1 bridge over the River Lea (Ware Bridge). It then crosses the Hertford East Branch Line and the New River to meet the A119 at a mini-roundabout. The river is followed for a few hundred yards back into open country. After they separate the road climbs into Great Amwell before descending again to reach the Amwell Roundabout on the A414, as well as meeting the B1502 (the original route of the A414 to Hertford) and the B181 to Stanstead Abbots.
After a couple more fields the A1170 enters the outskirts of Hoddesdon. Again the road is eased into the urban area, with a short service road initially providing access to the houses. There are a couple of roundabouts in the suburbs and we meet the B1197 at the last of these, before a short D2 stretch takes us into the town centre and The Sun Roundabout. The old A10 continued ahead but most of this is now pedestrianised. The road to the right is either a spur of the A1170 or the A10 and leads only to that road; this was planned as part of Ringway 4 and is one of the few sections of the northern half of that road to have been built.
We turn left along the relief road, then right at the next roundabout to continue our southerly route. The road becomes S2 again by Asda, after which we wheel left to rejoin the old A10 on the southern end of the High Street. This runs seamlessly into Broxbourne, where the New River is crossed again, and then Wormley. The road then becomes D2 and bears to the right; this the original northern end of the Cheshunt Bypass, which was opened as the A108 but which became the A10 after World War II.
The New River Arms Roundabout is then reached, from where the B176 bears left to join the original A10 into Cheshunt. A spur of the A10 is on the right here to reach the Turnford Interchange at a GSJ with one slip road missing, the one joining the southbound A10. The mainline of the A1170 continues ahead to provide that missing slip road. It remains D2 as far as the next roundabout where it meets the B156. Technically the A1170 ends here, as the road ahead is just the southbound A10 onslip. The old northbound carriageway still meets the roundabout here but is no more than a car park exit.