The Silvertown Tunnel is often in the news. Here's our guide to what it is, why it was built, and how to use it.
What is the Silvertown Tunnel?
It is a pair of road tunnels beneath the Thames connecting North Greenwich to the western end of Silvertown in the Royal Docks. They connect to the A1020 Silvertown Way/Lower Lea Crossing to the north, and feed into the Blackwall Tunnel Southern Approach road to the south. It's easier to understand on a map, which is why we embed this ⬇️
Why was it built?
The nearby Blackwall Tunnels are frequently congested or blocked, leading to long, polluting tailbacks. The Silvertown Tunnel is designed to provide extra capacity, and add redundancy that will help if the existing tunnels are blocked (happens almost daily). The scheme also opens up more bus routes across the river.
When did it open?
The tunnel opened as planned on Monday 7 April 2025.
How much did it cost?
Construction of the tunnel ate up something like £1.2 billion (2020 estimate). It'll now cost another estimated £1 billion over 25 years to pay for maintenance, financing and operation. The constructor Riverlinx paid up-front costs and will be paid back by TfL through money collected from tolls.
Tolls? Wait, what?
That's right. The new tunnel requires you to part with some pounds if you want to drive through. The charges are confusing, with three variables: time of day, type of vehicle, and how you pay.
During peak hours (6am-10am and 4pm-7pm, Monday to Friday), the fee is £4 for cars and small vans, £2.50 for a motorbike or moped, £6.50 for a large van, and £10 for an HGV.
Off peak (all other times), the prices come down a bit, but only for drivers using TfL's AutoPay system. Cars, motorbikes and small vans can cross for £1.50, large vans £2.50 and HGVs £5.
So won't everyone just use the Blackwall tunnels instead?
Nope. The previously free Blackwall tunnels are now tolled at the same rates. Whichever way you go, you'll have to spend money. That £1.2 billion construction debt would take decades to pay back if only one of the tunnels were tolled.
Who can use it?
Like Blackwall, the Silvertown tunnel is intended for motor vehicles only. No cycles, pedestrians, e-scooters, skateboards, pogo sticks...etc.
I don't have a car? Will I ever get to see this exciting new infrastructure?
You do have bus options, though they've been scaled back somewhat. Just two bus routes run regular services through the tunnel. The existing 129 service has been extended from its terminus at North Greenwich up through the Royal Docks. A new Superloop route called the SL4 now also uses the tunnel. Beware, though. That one's an express between Blackheath and Leamouth, and doesn't stop at North Greenwich. All buses through the tunnel are zero emission.
In a surprisingly generous twist, the various bus routes will all be free to use for at least the first year.
What about horses? Can you ride a pony and trap through the tunnel?
You don't actually need to know, do you? You're only asking to be picky, and to catch us out. As far as we can tell, nothing has ever been announced about equine usage. However, horse-drawn vehicles were banned from the neighbouring Blackwall Tunnel in 1947, so I think we can rule out the clip-clop echo of hooves.
What can cyclists do?
In approving construction, the Mayor agreed to look at ways to improve cross-river cycling provision in the area. The only local option currently is to take a bike onto the cable car (which is actually free for cyclists to use on weekdays before 9.30am). eBikes cannot use the cable car.
Now the tunnel's open, TfL runs a shuttle bus for the use of cyclists between Seagull Lane (close to Royal Victoria DLR station) on the north side and Millennium Way near the junction with Old School Close, to the south. Cycle buses run at least every 12 minutes between 06.30 to 21.30. Like the other buses, it will be free to use for at least the first year.
What can pedestrians do?
You'll never be able to walk from North Greenwich to the north side of the river, though you can cross using the foot tunnel at what I'm tempted to call Regular Greenwich. That'll bring you out at the southern tip of the Isle of Dogs, mind, a long way from the Silvertown Tunnel. If you're on foot and desperately want to use the tunnel, then you can hop aboard one of the two bus routes that pass through. Otherwise, the cable car and Jubilee line may serve your needs.
And horse-riders?
Oh cock off.
Did anyone object to the Silvertown Tunnel?
Oh golly gosh, yes. The project has been one big burrow o'strife from the word go. The chief concerns are the obvious ones: the increased pollution and traffic that a major new tunnel are likely to bring, particularly to Greenwich. Traffic through the area just south of the peninsula is already pretty ghastly. And remember, the tunnel's construction costs will be partly recouped through tolls. So it's in the operator's interests to keep traffic high for years to come, in order to keep the coins flowing.
Opposition has come from all political quarters, with No to Silvertown Tunnel and Stop the Silvertown Tunnel Coalition leading the charge. Friends of the Earth, Extinction Rebellion and numerous academics have also drawn attention to the expected environmental impact.
TfL would counter that, by providing contingency, the new tunnel will greatly reduce the number of idling vehicles at the oft-jammed Blackwall tunnels. Voila, less emissions overall. Campaigners would counter-counter argue that TfL should be focussing on reducing car use, by running trams or light railway through the new tunnel. TfL would counter-counter-counter argue that this would have less impact on the Blackwall situation, and would never pay off the construction overheads. And so the debate rumbled on. The tunnel is now open, and we shall see what effect it has on pollution and traffic levels.
So the public-transport horse has now bolted?
Enough with your horses already!
The official TfL page for the Silvertown Tunnel can be found here, with further information.
