Bus fares are being rolled back six years to encourage more shoppers to use public transport.
A £1 ticket will replace the £1.50 charge for using the number 50 bus from Hollingdean in Brighton to the Open Market and London Road shopping area from April 1.
Passengers who want to continue to the city centre will still have to pay the full rate under the terms of the three-month trial.
Roger French, the managing director of Brighton and Hove Bus and Coach Company, said: "We want to see what happens when we have a two-tier system on a route instead of one flat fare of £1.50. We are going to monitor firstly whether it encourages people to make new journeys and, secondly, does it encourage them not to go the whole way into the city centre but to make shorter journeys."
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