Bristol's M32 recently gained a new junction that - I'm sorry about this - you're not allowed to use. It has no junction number and a big "no entry" sign because it's for buses only. To mark this strange new addition to the motorway network, here are five places you can't leave the motorway, starting in Bristol.
The M32's bus only junction
Over the last couple of years works have been progressing to build a new junction on the M32, the little urban motorway spur from the M4 that travels in to the centre of Bristol. New sliproads have been formed between junctions 1 and 2, facing south towards Bristol, adjacent to the existing bridge that carries Stoke Lane over the motorway.
The brand new interchange would be extremely handy for avoiding the queues at junction 1 if it wasn't for the fact that, very unusually, it exists solely for the use of local bus services - part of Bristol's MetroBus project to create three high-frequency, high-speed bus routes. One route will run from Cribbs Causeway (to the north west of Bristol near the M5) through the city centre to Hengrove in the southern suburbs, and it will do it by joining the M32 from Stoke Lane. A new bus lane adjacent to the central reservation has been installed on the southbound motorway too.
For that reason, this junction isn't open to regular traffic. It has no junction number, though it does have advance signs that mark the exit with a no entry sign and a supplementary plate that reads "except local buses".
Should you decide that your car qualifies as a local bus for the purposes of trying out a shortcut to Frenchay, you'll find that the sliproads end in a roundabout where you will be invited to u-turn back towards Bristol, and only genuine buses are able to use the connecting road through to Stoke Lane. Sorry.
The M4 "works unit"
Spoiler alert: it's not really a works unit.
Travel eastbound on the M4 from Bristol towards London and you'll find an exit between junctions 14 and 13 that doesn't have any corresponding sliproads on the westbound side. The signs say "works unit only", so that would just make it another place for police patrols to turn around or a depot for maintenance vehicles or perhaps a salt store for the winter.
Except that it doesn't look like one. A normal "works unit" exit is just a paved track leading off the hard shoulder with some no entry signs and a metal gate. This is a pair of sliproads, one off and one on, built to full motorway specifications and complete with hard shoulders. They curve off to the left somewhere. It looks like an actual junction. And there isn't the usual blue sign to mark the entrance. It has signs like a regular junction at one mile, half a mile and at the diverge point, where the "works unit only" legend appears in black on a white panel with a red border - the colour conventions for signs to military sites.
The red border is the clue. It's not a motorway maintenance compound at all. The sliproads lead to a locked metal gate that opens on to a farm track, and the farm track leads in a straight line between fields to the back entrance to RAF Welford, a former airfield that has been used since 1955 as a vast munitions store by the US military. (Don't worry, these aren't state secrets - it's all on Wikipedia.)
You might not be allowed to take this exit, but a Google Streetview car boldly explored it in 2011, so you can still take a virtual journey right up to the locked gate and the red signs that explain how much trouble you'll be in if you go any further.
The M8's sliproad to the undergrowth
If you're unhappy about some sliproads being open to other people but not to you, then you might find this one more reassuring. Not only are you not allowed to use it, but neither is anybody else. Between junctions 16 and 17 of the M8, running through central Glasgow, are a series of odd sliproad stumps and bridges that were supposed to form the start of an unbuilt motorway northwards, and in their midst is a forgotten and forbidden sliproad.
The motorway and its junction were never built, but if you're travelling westbound you'll see a length of sliproad leaving the motorway on the right hand side (this is the M8 in Glasgow, so that's perfectly normal) and curving away under the opposite carriageway.
Don't take it, though, because if you peer under the bridge you'll see the sliproad then abruptly ends in an overgrown embankment just beyond. The curving sliproad is banked up quite steeply to allow the corner to be taken at speed, but that carefully designed engineering will now just enable exiting vehicles to reach the shrubbery more quickly.
The sliproad is the only substantial part of the Maryhill Motorway that was ever built. If it had been finished the motorway would have been faster, safer and, most significantly, would have served more important and less floral destinations. There's more information on Glasgow's unbuilt motorways in our article on Glasgow and at the Glasgow Motorway Archive.
The M60 back door to the Trafford Centre
If you find yourself on the M25 between junctions 16 and 17, have a look on the left hand side. Between two bridges carrying local roads across the motorway there is, now, an exit on both sides to a proper kerbed road heading away to the left. It exists to provide road access to a major work compound for the construction of HS2, and if it seems a strange way to provide access to a railway construction site, remember how vocal the opposition to the line was in this area and how neatly this avoids construction traffic using local roads.
This site will be quite a hive of activity in coming years, being positioned between the long tunnel that will carry the line under the West London suburbs and the other long tunnel that will take it under the Chilterns. Where the railway line briefly gets a sniff of fresh air there will be a lot of muck to take out and a lot of supplies to bring in.
The signs aren't up yet so we don't know how motorists will be warned of its presence, but the smart money is on another blue "works unit only" sign, the catch-all indicator of something just off the motorway that's none of your business.
More places you can't go
The motorway network is full of maintenance depots and gated access points to local roads that are used by works vehicles and police patrols. The junctions in this list are all a bit different to that. Have we missed any? If you're aware of any other unusual, private or secretive ways to get off the motorway then you can share them in the comments below.
There are at least two others on the M11. One is just to the south of Junction 6, another is between Junctions 8 and 9, roughly at marker post 60/0. Both are simple LILO slips that join up with Coopersale Lane and Wicken Road respectively. Used them often in my brief time as an inspector for Area 6.
Hi, If you travel south on the A5103 Princess parkway from Manchester, where you can turn on to the M60 and head east, just as you join the slip road there is another slip road that splits to the left that is just for buses. It heads under the M60.
Also as you approach this junction southwards there is a 40mph sign but then the next one you see is an end of motorway sign on the bus lane. You don't actually pass a sign telling you that national motorway speed limits apply. There are road paintings to say M60 and bus lane though. All rather confuddling.
There is similar bus only provision on both sides of the Parkway, with entry and exit routes meaning buses use local roads under the M60, albeit for a very short distance.
The idea is so that (1) buses can use the bus stops on the south side of the interchange without having to pull back across the M60 slips, and (2), they don't have to weave between that junction and the one to the south, which also has a pair of bus stops on the sllips.
As always, your writing is spot on, and sometimes makes me fall off my chair - "more important and less floral destinations", indeed!
There are two on the M77 between Junctions 1 and 2. Southbound, near J2, there is a small gate leading into Pollok Park, just after the footbridge through that park, while northbound there is access to the railway yard just before J1.
There's a pair of T-junctions at the north end of the M18 just south of Rawcliffe Bridge, onto VERY narrow single-track sliproads that lead to a small country lane, and another similar set on the M62 to the north-east of Rawcliffe Bridge. They're there so that emergency vehicles can join or leave the M18 or M62 near the junction where they meet, as the next junction with any local access is a long way from the interchange.
In both cases there are no gates at either end, but they're deep in the countryside of East Yorkshire and the roads they connect to are unclassified and very isolated, so the possibility of abuse is low. Plus, the entries and exits are so tight you'd have to take them at walking pace. I really don't envy any emergency vehicle driver who ends up having to use them.
One thing that surprises me is that the new M32 sliproads have full-width hard shoulders all the way to the roundabout. Pretty swish for under 100 vehicles a day.
There are two I know of. On the M20 immediately west of junction 5 are a pair of east-facing slips connecting to Hall Road via a gate. The off-slip (westbound) is signed "For Emergency Vehicles only." There is a large hospital about 2 miles away but this route is longer than by junction 5 itself.
On the M2 Medway Bridge, there is a cycle path on the north side adjacent to the carriageway. On the east side, it has its own secret sliproad-style connection to Borstal Road (again Google StreetView have ventured along the slip). On the west side, however, the cycle path re-uses the on-slip of old junction 2 (from prior to the second bridge build and M2 widening in 2003).
The Trafford Centre does actually have another open exit from the car park that goes straight onto the m60 towards Stockport. Bypasses the roundabout. No use if you want to go the other way.
The Trafford Centre gates are indeed for stated reasons. The Centre has comprehensive procedures in the event of an emergency, but if necessary, the motorway can be blocked whist traffic escapes the car parks directly onto the motorway.
The remnants of the southern terminus of the Collumpton by-pass still exist on the M5. It's signed as a police ramp and the far end is gated.
The M4 one you mentioned, if you go on Google street view for that one, the signs were replaced by the blue motorway signs in 2016
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- Signage diagrams for M32 taken from DfT Traffic Authorisation 4555 and used under the Open Government Licence.
- Picture of "works unit only" sign on M4 is taken from an original by Andrew Hackney and used under this Creative Commons licence.
- Picture of M8 sliproad in Glasgow is taken from Google Streetview.
- Picture of the Trafford Centre is taken from an original by David Lally and used under this Creative Commons licence.