This May bank holiday weekend is set to be a disruptive one for motorists, rail and air passengers.
The RAC is predicting the busiest May bank holiday on the roads since 2016.
Meanwhile, key London stations are shutting this weekend for engineering work.
There is also an ongoing security staff strike at Luton Airport.
After the four-day Easter shutdown of the UK’s fifth-busiest railway station, train travellers will find London Euston closed once again over the coming bank holiday weekend.
On 4, 5 and 6 May, no long-distance trains will run to and from Birmingham, Manchester, North Wales and Scotland on the West Coast main line. In addition, several other projects on the rail spine are taking place.
The operator, Virgin Trains, is warning passengers: “We highly recommend that you avoid travelling on these dates unless you absolutely have to. “If you do choose to travel then, make sure you plan carefully and give yourself more time to get to where you need to be.”
Today is predicted to be the busiest day of the bank holiday for motorists, according to the RAC.
More than four million separate leisure journeys will be taken by car today, predicts the RAC, which is more than 1.5 million than the same day last year.
Thirteen million leisure trips are expected to be taken by car this weekend, which marks the busiest May bank holiday on the roads for three years.
Tomorrow, 3.4 million journeys will be taken by car, up 900,000 on last year; and on Monday, there will be 3.1 million journeys, up 1.2m on 2018.
Airline passengers arriving at Gatwick and heading for London face delays due to a fault with the signalling system between the airport and East Croydon.
The London bound line is disrupted, with some trains delayed by over 15 minutes.
The West Coast main line through Watford Junction is disrupted by an earlier points failure.
Virgin Trains and London Northwestern services running through this station are returning to normal, however delays may still occur.
There are delays between Reading and Basingstoke due to animals on the railway line.
Trains have been delayed by up to 30 minutes, or cancelled. The line has now reopened.
Eurocontrol is warning of delays at Gatwick and Heathrow airports this morning.
Luton airport security staff are striking this weekend, over "heavy-handed" changes to shift patterns.
The airport has said that contingency plans are in place.
Read more about the strikes here:
If you're driving somewhere this bank holiday, the RAC has advised the best times to make your journey.
Today, the roads will be busiest between 4-7pm.
On Saturday and Sunday, the RAC advises making journeys before 10am and after 3pm.
On Monday, motorists should leave before 12pm or after 4pm to make their journey home.
From The Independent's travel correspondent Simon Calder:
Some British Airways arrivals at Heathrow are running well behind schedule this morning: the overnight arrivals from Miami and Houston are an hour late, while the morning flights from Milan Linate and Doha are four and eight hours late respectively.
There are road closures in Yorkshire this weekend as the Tour de Yorkshire gets underway.
For each stage of the race, which finishes in Leeds on 5 May, there will be "rolling closures", where roads will be closed around half an hour before the first cyclist comes through.
On Sunday, all city centre roads in Leeds will be closed.
Spectators can find the full timings here.
With an increased number of car journeys taking place this weekend for the bank holiday weekend, Green Flag is predicting that there will be 22 breakdowns every minute on British roads.
The breakdown cover provider estimates that there will be 161,445 breakdowns on UK roads between today and Tuesday, a 33 per cent increase in the average number.
To minimise disruption, Green Flag is urging motorists to check their cars before making long journeys.
According to Transport for London, most of the network will be running as normal this May bank holiday.
Here are the key closures you need to know about:
From 01:30 until 04:30 during tonight's Night Tube service, and from 03:50 until 05:50 during Saturday's Night Tube, there will be no service between Waterloo and Wembley Park on the Jubilee Line.
From tomorrow until Monday, there will be no service on the entire Bakerloo Line.
From tomorrow until Monday, there will be no service between Aldgate East and Barking on the District Line.
From tomorrow until Monday, there will no service between Liverpool Street and Barking on the Hammersmith & City Line, due to Crossrail work at Whitechapel.
There are some closures on the London Overground, and in some cases a reduced service.
As well as the closure of Euston station, the UK's fifth-busiest, Fenchurch Street station in London is closed this bank holiday weekend.
Services to and from south Essex diverted to Liverpool Street.
In addition, work to replace track between Farringdon and West Hampstead in London will close the north-south Thameslink line through the capital, though curtailed services will still run to Gatwick and Luton airports.
In Scotland, 4 May marks the start of large-scale work on the line between Aberdeen and Inverness, with disruption continuing until late August.
Meanwhile there is engineering work taking place between Glasgow and Motherwell, which is closing some lines this weekend.
For travellers between London and the West Midlands, the recommended route over the bank holiday is on Chiltern from Marylebone to Birmingham Moor Street, which is a 10-minute walk from the city’s main New Street station.
Travellers to and from Manchester and Liverpool can take this route and transfer to other services from New Street.
Alternatively, passengers for Manchester and Carlisle can travel on LNER from London King’s Cross and change at Leeds.
East Coast main line services operated by LNER are also the best options for Edinburgh and Glasgow.
Over Easter, however, many passengers complained about severe overcrowding on East Coast trains.
The East Midlands line from London St Pancras to Sheffield will be disrupted in the capital and between Derby and Chesterfield.
Network Rail says: “The railway is up to 50 per cent quieter than usual over bank holidays so doing work at this time of year minimises our impact on passengers who, as research shows, understand the need for such activity.”
Virgin Trains warns that "extensive" engineering work is taking place over the bank holiday weekend.
It advises only travelling if absolutely necessary. Check your journey before you travel.
Despite a security staff strike at Luton, the airport insists there is "no impact" from the industrial action and that the average wait time at security is between two and five minutes.
Meanwhile in Italy, some staff working at airports, and for the airlines Alitalia and Air Italy, will be walking out from 12 noon to 4pm local time.
EasyJet, which has dozens of flights scheduled between the UK and Italy, says it “plans to operate its full flying schedule”.
The airline says: “We do recommend that all customers flying to or from Italy on Friday 3 May allow extra time to get to the airport.
“Although this is outside of our control we would like to apologise to customers for any inconvenience and would like to assure them that we are doing all possible to minimise any disruption as a result of the industrial action.”
Looking forward to next week, there is a planned French air-traffic control strike from Wednesday until Friday.
On Thursday 9 May, French air-traffic controllers, alongside millions of other public servants, are planning on walking out in protest at President Macron’s plans to transform public service working conditions.
Air-traffic controllers and engineers will be walking out from 7pm local time on 8 May to 6am on 10 May.
Because so many aircraft usually overfly France, widespread delays and cancellations are likely.
But airlines will not know the likely impact until the coordinating body Eurocontrol conducts a teleconference on Tuesday 7 May.
Therefore passengers booked to fly during the strike may not be able to make alternative plans until very shortly before their intended departure.
If you're travelling on the Eurostar this weekend, services from the UK to Europe will not stop at Ebbsfleet today or tomorrow because French authorities will not be at the station.
Passengers should board at London St Pancras instead.
