Reusing existing crossings

One of the interesting things about this project is looking at how to create neat interchanges that avoid diversions for coaches that are also convenient for people to use to access local transport using existing infrastructure. Given that one of the more expensive elements are bridges and tunnels it is worth looking at how to reuse existing ones. It has been an interesting realisation that the best locations may be between, rather than at junctions. Start by looking for road or pedestrian crossing that are close to a park and ride sites, stations and other good transport links.

Take the A14 to the east of Ipswich as an example. There is a foot tunnel under the A14 close to the current A12 which was built for the old A12 route (‘London Road’) before the current junction to the SE was built. At a later date a park and ride site was built on part of the old road. Here is the current layout.

Convenient foot tunnel close to a park and ride site

Here is the tunnel from ground level.

A view of the pedestrian tunnel

My suggestion is that one should build out coach laybys on either side of the A14 above this tunnel with steps and a ramp down to the pedestrian tunnel. This keeps the coach route as efficient as possible, avoids an additional expensive bridge. The park and ride site has frequent buses, cycle storage and car parking.

Location of coach laybys

There is an interesting bridge on the M25 over the B172 close to Theydon Bois underground station which is one of the outer-most stations on the Central Line. With the addition of slip-roads down to this road coaches could access the station very efficiently.

Slip roads to a minor road to access an Central Line station

Here is a view of the bridge from the local road.

A view from the local road

I am well aware that this doesn’t meet current motorway regulations and that some drivers could be tempted to use it but there don’t appear to be any overwhelming problem that couldn’t be overcome.

Finally, here is a very minor bridge across the M25 which could provide access to the West Coast Main Line as well as to Kings Langley and potentially also Watford.

A very minor bridge over the M25 at Kings Langley

Here are the proposed slip roads and service road. I am not proposing this as the best solution for the area, only as a candidate to be considered and an example of the potential of re-using existing crossings of all sorts.

Kings Langley slip roads and access road


About PeterEastern
Amongst other things I am interested in the overlap between information technology and personal travel and how we can remain mobile whilst also greatly reducing the negative effects of our travel.

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