Road Humps and 20 mph Speed Limits

Debate between Iain Duncan Smith and Louie French

Tuesday 5th December 2023 Westminster Hall

[Sir Iain Duncan Smith]

I am a long way from Wales, but I take my right hon. Friend’s point about decisions being taken in an arbitrary manner and sometimes in pursuit of a wider political objective. I simply say that his comments have been noted, and I am sure that the Minister will consider them when he winds up the debate. I agree about making sure that local authorities—and even wider authorities such as the Mayor of London or the Government in Wales—consult properly and discuss with local residents their needs and concerns. Their consideration is important in the application of these measures in their areas.

Too many Londoners in my constituency and elsewhere are struggling on main roads that have rapidly been brought down from 40 mph to 20 mph. The lower speed limit means that there is almost invariably some focus on the speedometer rather than on the road, because people are concerned that they cannot afford the fine. This may seem apocryphal, but taxi drivers are saying that they are moving out of their line of work simply because it is becoming impossible for them to navigate this process, especially taking into account some of the calming measures that have been over-instated throughout the city, where some of the roads they use are now blocked, even for some of the residents.

The important point, which my right hon. Friend the Member for Preseli Pembrokeshire (Stephen Crabb) raised, is that enforcement can be lawfully carried out only by the police. The police are already under pressure, so it is difficult to see how the measures will not be abused, even when they are so little applied. The cost of the cameras alone is enormous. The extension of the 20 mph speed limits on main roads is affecting police workload.

I turn to a major issue in my constituency and, I believe, elsewhere. Speed bumps can be useful traffic-calming measures at times, but they are also extremely disruptive for residents, cyclists and emergency service vehicles in places where they may not necessarily need to be applied. My constituents have been genuinely affected by the roll-out of the 20 mph speed limits, combined with speed humps and the associated speed reduction measures in London. I know that I am not alone; many colleagues experience similar constituency issues.

Since the implementation of speed humps in residential areas, constituents have regularly raised with me the damage done to buildings by vibration transfer, such as cracking, possible subsidence, the long-term effects of the obstructions on local infrastructure, the increase in poor air quality, and emissions from vehicle engines, tyres and brake pads. Transport for London reports that in 2018, 75% of road transport particulate emissions came from tyre and brake wear. It is worth pointing out that many drivers naturally accelerate away from a speed hump, brake hard when they arrive at another, go over it and carry on. The emissions from brake pads and heavily used brakes are much greater than those coming out of the tailpipe of a diesel or petrol car. In a way, in the over-application—I stress the “over”—of these kinds of speed reduction measures, we are slightly contradicting our efforts to get pollution down.

[Mr Louie French (Old Bexley and Sidcup) (Con)]

Emissions are a subject that has been debated widely by London MPs and others in London, particularly because of the ultra low emission zone. Does my right hon. Friend agree that the increasing traffic that has resulted from a range of schemes—such as the low-traffic neighbourhoods that have closed off many side roads in London—carries a risk of increasing emissions? London is now officially the slowest city in the world to drive in.

[Sir Iain Duncan Smith]

I very much accept that point. I am grateful for my hon. Friend’s intervention, because I was going to come to that issue. It is not an issue particular to London, but in London we have the problem that traffic-calming measures are causing higher emissions in parts of the city where the measures are applied, and at the same time traffic is being funnelled with no escape routes.

We also need to take into consideration the increase in noise pollution during the day. Conversations are being drowned out in many houses near the humps, and the effect of the additional noise on residents living in the vicinity of a hump—not forgetting that the traffic goes up and down such roads all through the night—is that sleep is disturbed.

I have been in a number of houses and have stood and watched as commercial vehicles have gone over large 20 mph tables. I could hear the equipment in the back leaping up and down and the thump as the vehicles hit the tables—and they were not going over the speed limit. That is the point. When I have raised it with the council, it has dismissed it completely on the basis that it does not agree that the measures cause any problem whatever. The effects of additional noise on residents living in the vicinity include disturbed sleep and the stress resulting from sleep deprivation.