Motorists are being warned to expect congestion and delays around Leicester today, with both of the city's major sports teams playing home fixtures on the first big shopping Saturday in December.
Traffic police advised shoppers as well as sports fans to take steps to minimise congestion and disruption.
About 44,000 spectators were expected to watch Leicester City taken on local rivals Derby County at 5.15pm, at the King Power Stadium. Leicester Tigers were hosting Bath, at Welford Road, with the kick-off at 12.30pm.
Police and the city council said they were deploying extra staff and that additional car parking had been made available.
However, they warned there was likely to be higher than usual traffic flows between 2.15pm and 5.15pm, when people will be leaving and arriving in the city, with parking spaces near to the sports stadiums at a premium, particularly for fans attending the football.
Adrian Russell, chairman of the city's safety advisory group, said: "We have been working closely with the clubs and the emergency services over this fixture clash.
"We've introduced a few extra measures that should help make this event pass off smoothly, with minimal congestion.
"However, it is important that all members of the public be aware of the relatively unusual nature of this fixture clash, which may affect their normal travel and parking arrangements."
Visitors were advised to allow extra time for their journeys, be mindful of congestion around the sports stadiums and use public transport or park-and-ride buses if possible.
Football fans were advised to share cars and be aware their normal parking arrangements might not be possible.
Tigers supporters have been asked to arrive at the stadium as early as they can, preferably by noon to walk or use buses to get to the ground.
They should consider parking at Bannatynes Health Club, in Welford Road, De Montfort University, The Gateway, where additional parking has been made available and which will be signposted around the city centre.