Britons traveling in Central London on the day of the funeral are advised to postpone their journey if possible. The capital is expected to be hardest hit due to road closures and large crowds.
Parts of central London are closed to normal traffic and bus routes in some areas of the capital are likely to be affected.
The subway runs as usual, but some station access points will be closed or can only be exited.
Many roads between Windsor and London will be closed while the Queen embarks on her final journey.
Transport for London emailed passengers warning not to drive through central London on September 19.
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It said: “You should avoid driving into (affected) areas during this time. If you must drive, please do your research before you travel, allow extra time for your trip, use alternative routes, and expect lengthy delays.
“Bus routes in central, west and south-west London will also be badly affected, with many routes being diverted or stopping short of their destinations.”
It added that some roads could reopen on Monday evening, depending on advice from police and other authorities.
Some public transport operators across the country will operate a reduced timetable today to allow colleagues to pay their respects to the Queen.
DO NOT MISS
Air traffic restrictions apply at Heathrow as flights normally land via central London to the UK’s major airport.
Around 200 flights to and from Heathrow Airport have been canceled to avoid aircraft noise disrupting the funeral.
Heathrow said: “As a mark of respect for the celebration of this sad and unique occasion, operations at the airport will be modified to avoid noise disturbances during the State Funeral.
There will be four periods when flights will be affected, all falling at key moments on the funeral day.
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British Airways canceled around 100 flights to and from Heathrow on Monday and Virgin Atlantic canceled four flights.
Flights from London City Airport will not fly via Westminster during the State Funeral.
A spokesman said: “During the state funeral, London City flights will not fly via Westminster out of respect for the funeral service for Her Majesty the Queen.
“We are working closely with our airlines to operate a normal flight schedule that day and if flight times change, passengers will be notified by their airlines.”
Crowds at train stations are expected to be heaviest on Monday afternoon as people leave the capital after the funeral.
Passengers can have a more comfortable journey by postponing their trip to later in the day.
Great Western Railway added an hourly service from London to Swindon, Bath and Bristol on Monday evening.
Welfare trains will be stationed at some stations including London Marylebone, St Pancras and King’s Cross where people can rest comfortably.