police officers, it's not enough to see everyone all of the time. they'll be expecting the crowds to be their eyes and ears for security. most people are coming here because they want to be here to celebrate the day. so they won't tolerate misbehavior. so the police will be hoping that the crowd will be its first line of security in many ways. >> the route itself is different obviously from the route that princess charles and diana took. they got married at st. paul's cathedral. that was a longer route. what impact will this have on security. >> when the royal couple was coming from st. paul's cathedral, it was a long route. the crowd had much more opportunity to spread out. here it's a short root from the abbey back to buckingham palace. the crowd will be much denser. in some ways it's a shorter route for the police to be