A broad range of visible security measures will be in place - like the extensive network of Automatic Number Plate Recognition (ANPR) technology, Closed Circuit Television (CCTV) and Hostile Vehicle Mitigation (HVM) barriers - as well as many security measures that the public can't see, police share.
People will have to go through body scanners to get to the town of Windsor in the lead up to the ceremony in St George's Chapel on May 19.
British Transport Police said they will be patrolling incoming trains and railway stations on the day of the royal wedding.
Harry and Meghan have invited 600 guests to attend their wedding and 200 family and friends will be at an evening reception hosted by the Prince of Wales at Frogmore House.
Well-wishers who want to line the streets of the procession to catch a glimpse of the newlyweds are being warned to expect a "screening and searching" regime, including police officers inspecting any sleeping bags that could hide materials to cause trouble. The current threat from terrorism in the United Kingdom, set by MI5, is severe.
The Metropolitan Police Service and Surrey Police will also be involved with the policing operation which is standard for large scale events such as Royal weddings.
All leaves for Thames Valley Polices 4,200-strong force has been cancelled, though police are refusing to say exactly how many officers will be deployed in the security operation.
On May 19, visitors to Windsor might be stopped and checked by roads policing officers.
When TV actor Meghan Markle walks down the aisle with Prince Harry this summer the last thing she will be trying to think of is her previous marriage to movie producer Trevor Engelson.
'We are working with our partners, local businesses and the community to deliver a safe, secure and happy event for everyone'.
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