Using the underground railway system is the fastest way to get around London in Watch Dogs: Legion.
To fast travel bring up the map and look for the Underground icons. Not all of them will be available from the beginning, you must first uncover them. Interact with the station icon to travel there immediately. Additionally, you can also fast travel to DedSec safehouse.
AldgateAngelBankBanksideBethnal GreenBrewer St.BrixtonCamden TownCannon StreetCharing Cross StationCovent GardenElephant & CastleEmbankmentEmbassyEuston StationFarringdonGoodge StreetGreen ParkHolbornHorseferry RoadHoxtonKenningtonKing's Cross StationLambethLondon BridgeMoorgateMornington CrescentNine ElmsOld Kent RoadOld StreetOxford CircusPiccadilly CircusPimlicoRiversideShadwellShoreditch High StreetSt. James's ParkSt. Pancras InternationalSt. Paul'sStockwellTempleTidisTower HillTrafalgar SquareVauxhallViaductVictoriaWalworth Rd.WappingWarren StreetWaterlooWestminsterWhitechapel