Drivers could face 90 minutes of delays in traffic this bank holiday weekend, according to traffic data firm Inrix.

With a high volume of holidaymakers set to take to the UK’s roads and National Rail delivering over 30 engineering projects during the bank holiday weekend, drivers can expect delays of up to 90 minutes on peak routes, increasing by an average of 27% across the country, based on the latest Inrix data.

Commuters in London and the South East of England will experience the most congestion, with traffic almost 50% higher than usual. The M25 between junctions 9 and 21 (both directions) tops the list of expected delays with an anticipated 90 minutes of gridlock, meaning travellers planning to fly from Heathrow Airport, which carried almost 75 million passengers in 2015, or Gatwick Airport, should seek alternative routes or factor in additional time to catch their flight.

Those heading to less far flung destinations in and around Bristol and Weston-super-Mare should also plan for delays on the M5 of up to one hour. Drivers visiting Manchester face delays of up to 45 minutes on the M6 between Keele and Knutsford and between junction 19 and 22, as do those using the M6 to travel to Liverpool. Londoners should be prepared for closures on rail lines in and out of the capital, as well as a reduced service on a number of TfL lines.

The busiest period over the entire bank holiday weekend will be on the Friday rush hour, with peak congestion expected around 5 p.m. as travellers start their journeys to take advantage of the long weekend. Traffic levels are expected to peak on Friday 29th April between 4pm and 6pm.

Greg Hallsworth, UK traffic analyst at Inrix said: “Drivers in the UK are no strangers to traffic, spending an average of 30 hours in gridlock last year. At peak times like the bank holidays – particularly this bank holiday as it coincides with the UK half term – roads that are already stretched have the added pressure of holidaymakers and railway engineering works. Our advice to drivers is to check before starting your journey, travel at smarter times and take alternative routes to avoid delays hampering plans.

“If you must travel at the busiest times check the Inrix traffic website for real time traffic information, use the Transport for London website (www.tfl.gov.uk/traffic/status) for updates in the capital, or tune into local radio and TV to help steer clear of delays.”

Edmund King, AA president, added: “Spring bank holiday and the start of the summer half term are on a collision course on Friday and drivers will have to expect delays. With temperatures picking up, travellers will have to make sure their cars don’t overheat and also carry water for themselves should they get stuck in a traffic jam. Delaying departure until later in the evening is often a shrewd move as the combination of work exit and holiday exodus traffic tends to ease after the rush-hour. Using mobile phone services, like the AA App, gives drivers the heads-up on levels of traffic and hold-ups ahead, with the option to avoid them.”

ROUTE

DELAY

ALTERNATIVE ROUTES

M25 between J9 and J21 (both directions)

90 minutes

Non-M’way routes

M5 Southbound between J14 and J22 Highbridge

90 minutes

A-roads around Bristol

M6 between Keele and Knutsford Northb'd

45 mins

A34/A500

M6 between J19 and J22 (both directions)

45 mins

No obvious alternative

A34 between Abingdon and M40 Northb'd

40 mins

A419 & A429

M4 between London & West Country Westbound

40 mins

M3

M60/M62 between J8 Carrington and J20 Rochdale (both ways)

40 mins

M60/A627M

M5 between J4a and J7 (both directions)

40 mins

M42/A46/A38

A55 Westbound between Chester and Conwy (Westbound)

30 mins

None

A303 Andover to Amesbury (Westbound)

30 mins

A36 and A338

M25 between J4 and Dartford Tunnel (A/CW)

30 mins

A2 / Blackwall Tunnel

A1 between Chester-le-Street and Gosforth Park (b/ways)

20 mins

A19 Tyne Tunnel