The procession takes the couple along Castle Hill, the High Street and into Windsor town centre, before returning along the Long Walk to the castle.
Meghan Markle's half brother Thomas Markle Jr. has penned an open letter to Prince Harry urging him not to Wednesday the former "Suits" star, telling him that Meghan is "obviously not the right woman" for him. In an interview with Good Morning America, Williams says it is important that the bride soak up the moment and be present in all that is taking place.
Thomas Markle Jr., aged 51, resident of Grant's Pass, Oregon, wrote a handwritten letter to Harry urging him not to marry Meghan, saying "it's not to late".
After the wedding, too, Prince Harry's marriage will be different than his older brother's.
The Ascot Landau is a "wonderfully bright, small, lovely carriage, (that is) very easy for people to see", according to a description on the royal website by Crown Equerry Col. Toby Browne.
The newlyweds will make their journey with a traveling Escort of the Household Mounted Regiment starting at 1:00 p.m.
The Ascot Landau will be the centre piece of public celebrations after the couple marry in St George's Chapel at Windsor Castle. Their wedding was also a state wedding, and the Imperial State Landau is often used by The Queen to meet Foreign Heads of State when they arrive on State Visits to Britain.
The carriage was last used by the Queen and Prince Philip during Her Majesty's 90th birthday celebrations.
The carriage chosen for the royal wedding by the couple is the Ascot Landau (fair weather option) which was used in the royal wedding in 2011 to take the pages and the bridesmaids from Westminster to Buckingham Palace.
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