Portland Crescent Area 20mph zone

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Welcome to the Portland Crescent Area 20mph Zone Scheme engagement page.

London Borough of Harrow's engagement on traffic calming measures in the Portland Crescent area will run for seven weeks from 28 October to 15 December 2026.

You can view the proposals now. The survey will open on Wednesday 28 October 2026.


What are we proposing?

We are proposing to introduce a 20mph speed limit alongside traffic-calming measures to help reduce vehicle speeds and improve road safety for everyone.

These measures include a combination of sinusoidal speed humps, entry treatments and 20mph road markings.

We want to hear what local residents and other people who use the area think before a decision is made.


Why are we proposing these changes?

We work with Transport for London (TfL) to improve road safety across Harrow, including looking at road traffic collisions and identifying where changes to the road network could help improve safety.

In 2023, we carried out a borough-wide review to identify areas where 20mph zones and traffic-calming measures could be introduced. The areas were ranked in order of priority, and we have been working through this programme. The Portland Crescent area is now next for consideration.

People walking, cycling and riding motorcycles can be particularly vulnerable if a collision happens. Reducing vehicle speeds, particularly on residential roads, can help make roads safer and make walking and cycling easier.

The proposals aim to:

  • reduce vehicle speeds and the risk of collisions
  • improve safety for people walking and cycling
  • encourage more walking and cycling
  • discourage vehicles from using residential roads as shortcuts.


Where is the scheme proposed?

The proposed 20mph zone would include:

Carisbrooke Close, Charmian Avenue, Clydesdale Avenue, Fairways, Honeypot Lane (Service Road), Langland Crescent, Portland Crescent & Streatfield Road (Parade).


What would change?

A 20mph speed limit would be introduced across the proposed zone. Different traffic-calming measures would be used to help reduce vehicle speeds, depending on the location and type of road.


Proposed traffic-calming measures

The following traffic-calming measures are proposed:

  1. Sinusoidal Humps - Sinusoidal speed humps are similar to traditional round-top humps but have a gentler initial slope and extend across the full width of the road. They are designed to reduce vehicle speeds while reducing discomfort for people cycling and passengers on buses.
  2. Raised Junction / Entry Treatment - A raised section of road, with a ramp on both sides. This reduces traffic speed whilst providing a level area at the top of the ramp where pedestrians can cross more conveniently. At present, Portland Crescent and Langland Crescent both have raised entry treatments at their respective junctions with Streatfield Road.
  3. 20mph Road Markings - 20mph roundels would be marked on the road at selected locations to remind drivers of the speed limit. They are generally used where physical traffic-calming measures are difficult or inappropriate to install.


The detailed plan showing the proposed 20mph zone and associated traffic-calming measures can be viewed by clicking on the link below:

Portland Crescent 20mph Zone - Public Consultation Plan


What about emergency vehicles?

We recognise that traffic-calming measures can affect emergency vehicles.

The police, fire and ambulance services, along with other interested organisations, will be consulted on the proposals. Their feedback will be considered alongside responses to the public consultation before a final decision is made.


Will the proposals cause additional noise?

The proposed traffic calming measures are designed to reduce vehicle speeds. There may be some additional noise or vibration as vehicles pass over speed humps or entry treatments.

Any concerns raised about noise or vibration will be considered as part of the consultation before a final decision is made.


Have your say

We want to know what you think about the proposed 20mph zone and traffic-calming measures.

The survey will be open from Wednesday 28 October until 11.59pm on Tuesday 15 December 2026. Once open, you can complete it below.

If you require further clarification on the proposals, please email transportation@harrow.gov.uk


What happens next?

After the consultation closes, we will analyse the responses received and consider whether any changes should be made to the proposals.

The consultation findings and proposals will then be considered by the Highways Decision Board, which will decide whether the scheme should go ahead.

We will publish an update on MyHarrow Talk once a decision has been made.

If the scheme is approved, construction is currently expected to start in Summer 2027, subject to contractor availability and weather conditions.

Welcome to the Portland Crescent Area 20mph Zone Scheme engagement page.

London Borough of Harrow's engagement on traffic calming measures in the Portland Crescent area will run for seven weeks from 28 October to 15 December 2026.

You can view the proposals now. The survey will open on Wednesday 28 October 2026.


What are we proposing?

We are proposing to introduce a 20mph speed limit alongside traffic-calming measures to help reduce vehicle speeds and improve road safety for everyone.

These measures include a combination of sinusoidal speed humps, entry treatments and 20mph road markings.

We want to hear what local residents and other people who use the area think before a decision is made.


Why are we proposing these changes?

We work with Transport for London (TfL) to improve road safety across Harrow, including looking at road traffic collisions and identifying where changes to the road network could help improve safety.

In 2023, we carried out a borough-wide review to identify areas where 20mph zones and traffic-calming measures could be introduced. The areas were ranked in order of priority, and we have been working through this programme. The Portland Crescent area is now next for consideration.

People walking, cycling and riding motorcycles can be particularly vulnerable if a collision happens. Reducing vehicle speeds, particularly on residential roads, can help make roads safer and make walking and cycling easier.

The proposals aim to:

  • reduce vehicle speeds and the risk of collisions
  • improve safety for people walking and cycling
  • encourage more walking and cycling
  • discourage vehicles from using residential roads as shortcuts.


Where is the scheme proposed?

The proposed 20mph zone would include:

Carisbrooke Close, Charmian Avenue, Clydesdale Avenue, Fairways, Honeypot Lane (Service Road), Langland Crescent, Portland Crescent & Streatfield Road (Parade).


What would change?

A 20mph speed limit would be introduced across the proposed zone. Different traffic-calming measures would be used to help reduce vehicle speeds, depending on the location and type of road.


Proposed traffic-calming measures

The following traffic-calming measures are proposed:

  1. Sinusoidal Humps - Sinusoidal speed humps are similar to traditional round-top humps but have a gentler initial slope and extend across the full width of the road. They are designed to reduce vehicle speeds while reducing discomfort for people cycling and passengers on buses.
  2. Raised Junction / Entry Treatment - A raised section of road, with a ramp on both sides. This reduces traffic speed whilst providing a level area at the top of the ramp where pedestrians can cross more conveniently. At present, Portland Crescent and Langland Crescent both have raised entry treatments at their respective junctions with Streatfield Road.
  3. 20mph Road Markings - 20mph roundels would be marked on the road at selected locations to remind drivers of the speed limit. They are generally used where physical traffic-calming measures are difficult or inappropriate to install.


The detailed plan showing the proposed 20mph zone and associated traffic-calming measures can be viewed by clicking on the link below:

Portland Crescent 20mph Zone - Public Consultation Plan


What about emergency vehicles?

We recognise that traffic-calming measures can affect emergency vehicles.

The police, fire and ambulance services, along with other interested organisations, will be consulted on the proposals. Their feedback will be considered alongside responses to the public consultation before a final decision is made.


Will the proposals cause additional noise?

The proposed traffic calming measures are designed to reduce vehicle speeds. There may be some additional noise or vibration as vehicles pass over speed humps or entry treatments.

Any concerns raised about noise or vibration will be considered as part of the consultation before a final decision is made.


Have your say

We want to know what you think about the proposed 20mph zone and traffic-calming measures.

The survey will be open from Wednesday 28 October until 11.59pm on Tuesday 15 December 2026. Once open, you can complete it below.

If you require further clarification on the proposals, please email transportation@harrow.gov.uk


What happens next?

After the consultation closes, we will analyse the responses received and consider whether any changes should be made to the proposals.

The consultation findings and proposals will then be considered by the Highways Decision Board, which will decide whether the scheme should go ahead.

We will publish an update on MyHarrow Talk once a decision has been made.

If the scheme is approved, construction is currently expected to start in Summer 2027, subject to contractor availability and weather conditions.

Page published: 23 Oct 2026, 10:24 AM