A404 (HARROW ROAD) Traffic

Traffic and travel conditions for the A404 20:36pm

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FULL SCREEN UPDATED: 20:36
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Traffic incidents

The following traffic incidents and congestion for A404 have been reported by Highways England, Traffic Scotland, Traffic Wales or Transport for London (TfL) in the last two hours:

CONGESTION
Location: The A404 northbound at the junction with the M40 .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 18:00 and 18:15 on 13 Mar 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.57m from High Wycombe. CLEARED @ 18:09
CONGESTION
Location: The A404 southbound exit slip to the A4155 .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 17:15 and 17:30 on 13 Mar 2026.
Nearest town: 1.19m from Marlow. CLEARED @ 17:24
CONGESTION
Location: The A404 northbound between the A4130 and the junction with the A308 .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 16:45 and 17:00 on 13 Mar 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 2.75m from Marlow. CLEARED @ 16:57
CONGESTION
Location: The A404 northbound at the junction with the M40 .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 16:00 and 16:15 on 13 Mar 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.57m from High Wycombe. CLEARED @ 16:03
CONGESTION
Location: The A404 northbound at the junction with the M40 .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 15:15 and 15:30 on 13 Mar 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.57m from High Wycombe. CLEARED @ 15:18


There are no current incidents in this location.

A404 Roadworks

The following roadworks have been reported by various highways agencies and official transport sources. Click on a roadworks item to view more details on the traffic map.

A404

The A404 (also known as the Amersham Road) is a major road in Buckinghamshire and Middlesex, England. It runs between the A40 at High Wycombe on the outskirts of London and the M40 motorway at Wycombe Marsh, near to Loudwater. The A404 was first built in the 1930s as an extension of the old Watford By-Pass, connecting it to the M40 at Wycombe Marsh. In 1993 the road was widened from dual to four lanes, greatly improving the traffic flow.

Today, the A404 is a heavily used route, especially during rush hours. Between 8am and 9am, and 4pm and 6pm, the road experiences the heaviest traffic flows.

In terms of safety statistics, preliminary results from the Road Safety Foundation’s Annual Status Report (2020) show that there were two fatalities, five serious injuries and 27 slight injuries reported on the A404 in the past three years. The safety record of the road is just above average, with the department for Transport's Road Safety Indicators rating it 9th out of 18 primary A roads.

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LEGAL NOTICE

Please remember that it is against the law to use your mobile phone, tablet or any electronic device without a hands-free kit whilst driving. If you're caught by the police using any device that can send or receive data whilst driving or riding a motorcyle you'll get an automatic fixed penalty notice, 6 points on your licence and a fine of £200. A court could also disqualify you from driving.

Elsewhere on the web:

National Highways TrafficNational Highways England

Official source of traffic updates.

Transport for LondonTransport for London (TFL)

Transport for London's (TfL) portal for transportation in London.

Traffic WalesTraffic Wales

The Welsh government's traffic information service for Wales.

Traffic ScotlandTraffic Scotland

Live traffic conditions and news for Scotland's road network.

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Location: northbound at the junction with the M40 .

Due to: Congestion.



Normal traffic conditions are expected between 18:00 and 18:15 on 13 March 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.57m from High Wycombe.

51.61--0.77

Location: southbound exit slip to the A4155 .

Due to: Congestion.



Normal traffic conditions are expected between 17:15 and 17:30 on 13 March 2026.
Nearest town: 1.19m from Marlow.

51.58--0.76

Location: northbound between the A4130 and the junction with the A308 .

Due to: Congestion.



Normal traffic conditions are expected between 16:45 and 17:00 on 13 March 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 2.75m from Marlow.

51.53--0.78

Location: northbound at the junction with the M40 .

Due to: Congestion.



Normal traffic conditions are expected between 16:00 and 16:15 on 13 March 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.57m from High Wycombe.

51.61--0.77

Location: northbound at the junction with the M40 .

Due to: Congestion.



Normal traffic conditions are expected between 15:15 and 15:30 on 13 March 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.57m from High Wycombe.

51.61--0.77