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Hertfordshire County Council

20mph programme in Hertfordshire

 
Our projects and consultations

 

Search for a town or sort results by location.
 

Roadworks and road closures

StatusLocation

Consulting now

Barkway – In development

Consulting now

Barley - In development

In development

Bedmond

Consulting soon

Bishop's Stortford

Consulting soon

Bushey

Consulting soon

Bushey Heath

Not proceeding

Carpenders Park

Consulting soon

Cockernhoe and Mangrove Green

Consulting soon

Essendon

Consulting now

Great Offley – In development

Consulting soon

Harpenden

Consulting soon

Hatfield

Consulting soon

Hertford

In development

Hitchin

Consulting soon

How Wood

Not proceeding

Knebworth

Consulting soon

Letchworth

In development

Long Marston

Consulting now

Maple Cross – In development

Consulting soon

Markyate

Consulting soon

Park Street

Not proceeding

Potters Bar

Consulting soon

Rickmansworth

In development

Royston

Consulting soon

South Mimms

Consulting soon

South Oxhey

Consulting soon

St Albans

Consulting soon

Thundridge, Wadesmill and High Cross

Consulting soon

Watford

Consulting soon

Welwyn Garden City

In development

Welham Green area

In development

London Colney phase 2

Waiting for implementation

Little Wymondley and Great Wymondley

In development

Bushey North

Under construction

St Albans North and Central

Under construction

Wheathampstead

Not proceeding

Borehamwood

Not proceeding

Stevenage

Potential area

Hemel Hempstead

Not proceeding

Ware south

Not proceeding

Waltham Cross and Cheshunt central

Under construction

Baldock

Under construction

Bishop's Stortford West

Now complete

Ware town centre

Under construction

Welwyn Village

Under construction

Woolmer Green and Oaklands

Now complete

St Albans Central and East

Now complete

Pirton Village

Now complete

Stanstead Abbotts and Stanstead St Margarets

Now complete

West Watford and Cassiobury Park triangle areas

Now complete

Graveley

Consulting soon

Bricket Wood

Consulting soon

Chiswell Green

In development

Buntingford

Not proceeding

Bovingdon

Not proceeding

Cheshunt West

Not proceeding

Cuffley

Not proceeding

Elstree

Not proceeding

Hoddesdon North

Not proceeding

Turnford and Wormley

Not proceeding

Walkern

 

What each status means

 

  • Consulting now – we're currently seeking views on proposals.
  • Consulting soon - we plan to consult on proposals in the next 6 months.
  • Potential area – locations flagged as possible candidates for 20mph zones in the near future.
  • In development – we are in the process of assessing and designing the scheme.
  • Waiting for implementation  – locations where consultations were supported by the community, with plans approved and construction scheduled soon.
  • Under construction – locations where works are underway to implement the 20mph scheme.
  • Now complete – recently completed 20mph schemes.
  • Not proceeding – locations where a proposed 20mph scheme will not proceed due to a local consultation result or local councillor decision.
  • Not proceeding due to local councillor decision - location where we are not developing a proposal, following a decision by local councillors.

 

 
 

 


Why 20mph?

 
The funding has been set aside for 20mph schemes, so it can't be used for fixing potholes or other repairs. Road maintenance is funded separately and is ongoing.

 

 

 


What we'll do

Prioritise areas

 
We are prioritising areas where:

  • residents and businesses support lower speeds
  • existing speeds, vehicle numbers, nearby schools and other local factors show the need and benefit of change.

We plan to introduce 20mph limits across whole areas, not just on single streets. We'll also include no-through roads and short streets in those areas. A consistent speed limit is less confusing, reduces speeding between zones and minimises clutter from speed limit signs.

Some main roads will not be included because they carry more traffic, have a different road layout or are important for keeping vehicles moving around the wider area.
 

Consultations

 
Before any changes are made, we'll ask local residents, councillors and community groups for their views through consultations.

We will clearly explain:

  • what is being proposed
  • how to take part in consultations
  • how feedback will shape the final design.

As plans progress, we’ll keep residents updated through a variety of different ways such as letters, posters and online. 

Install signs, road markings and traffic calming measures

 
Once we've got a legal order to change the speed limit, we will install signs and road markings. These works are usually quick and done in stages over several days to minimise disruption. Some markings need dry weather.

What signs and markings we'll install and why

If needed, we'll also install traffic calming measures. We plan this work to keep disruption low. Some work may take place at night, or use temporary traffic lights or short road closures.

Traffic calming measures we may use

We'll tell local residents:

  • when the work will happen.
  • how long it will last.
  • any local impacts to expect.

You may notice new signs appearing first, followed by new markings or other measures.
 

Monitor

 
We monitor speeds for up to 12 months after a new 20mph area is put in. This gives drivers time to get used to the new limit and provides more accurate before-and-after data. If speeds do not drop as expected, we review the area and may add more measures. 

 


Traffic calming measures we use

Speed cushions

 
Speed cushions are small, raised bumps placed in pairs or sets across the road. They slow cars down while allowing larger vehicles to pass more smoothly.

Why?

  • Slow down cars but do not hold up emergency vehicles.
  • Buses can travel over them more easily.
  • Cyclists can avoid the bumps, making routes safer and more comfortable for cycling.
  • Do not block road drains or gutters.
     
Raised crossings

 
Raised crossings are zebra or signal controlled crossings (e.g. pelican crossings) lifted to the same height as the pavement.

Why?

  • Easier for wheelchair users, mobility scooters and people with pushchairs.
  • Slow vehicles as they reach the crossing.
  • Improve safety and accessibility in busy areas where lots of people cross.
  • Help drivers notice that they are entering a pedestrian focused space.
     
Raised tables 

 
Raised tables are larger flat raised areas of road, often used at junctions or where slower speeds are needed.

Why?

  • Slow vehicles without creating sharp bumps or jolts.
  • Help keep speeds low without making journeys uncomfortable.
  • More comfortable for buses and cyclists.
  • Can be shaped to fit different types of roads and junctions.
     
Speed humps

 
Speed humps are full width bumps that stretch from one side of the road to the other.

Why?

  • Very effective at reducing high vehicle speeds.
  • Useful in school streets and residential areas.
  • Help keep speeds low where buses may not need to pass over them.
     
Speed limit signs and road markings

 
National rules require:

  • clear signs at the start and end of each 20mph zone.
  • smaller signs or road markings every 80–100 metres within the zone (unless there are physical measures like speed humps).

We'll add or refresh markings on the road, including painted ‘20’ roundels and white lines.

We know that signs outside homes can be frustrating, so we choose sign locations carefully and try to keep signage to a minimum. Where possible, we use existing posts and pillars.

Why?

  • Makes speed limits easy and clear to see for all road users.
  • Supports safer and more consistent driving behaviour.
  • Ensures speed limit is clear and enforceable.
  • Repeaters provider clear reminders of the speed limit.
  • Helps highlight crossings and traffic calming features.
     

 

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