The funeral route will start at the Palace Westminster before taken up Whitehall, past Trafalgar Square and to the church of St Clement Danes in the Strand.
Former Met police commander Bob Milton told Daybreak that it would be highly unlikely someone would attempt a terrorist attack on Margaret Thatcher's funeral today.
More than four thousand police officers have been drafted in for the funeral, amid fears of demonstrations and protests.
– Bob Milton, former Met police commander
The measures that we can put in place will make it very difficult for someone to try and disrupt this funeral today and attack the funeral, and that's important for the public to understand.
More than 4,000 police officers will be on duty tomorrow for Baroness Thatcher's funeral, Scotland Yard said today.
The Metropolitan Police also revealed that "a small number" of protesters have contacted them to say that they plan to demonstrate during the event.
The force is running a joint operation with City of London Police and British Transport Police.
Commander Christine Jones said, "We have been approached by a small number of people planning to protest. We are working with them, and would ask anyone who plans to protest to come forward and speak with us today".
"We will continue to review our intelligence and evidence picture, and although to date no arrests connected to the ceremonial funeral have yet been made, should the need arise to arrest those who are committing acts of crime or violence, or conspiring to do so, we will respond accordingly".
Former Metropolitan Police Officer Graham Whettone has told Daybreak that security protocols surrounding Margaret Thatcher's funeral will most likely be reviewed in light of what happened at the Boston Marathon.
He said: "If they need to advance [the plans] then they will do, there's different tactical options the police can employ at various events, they will just review those now, if they need to advancer them then they will do."