The three buses that run through the Blackwall and Silvertown Tunnels will remain free until May 27, Transport for London has said.
The concession was introduced in April last year to promote the Silvertown Tunnel and the two routes running through it – the 129 between Lewisham and Great Eastern Quay and the SL4 between Grove Park and Canary Wharf.
Route 108, which runs between Lewisham and Stratford International, was also included in the offer.
The perk – which applies on all trips, whether or not they cross the Thames – had been intended to last at least a year. TfL has now confirmed that it will run for another seven weeks.
Cross-river trips on the Docklands Light Railway between Greenwich/Cutty Sark and Island Gardens, and Woolwich Arsenal to King George V, will also remain free until the end of May 27. Passengers making those specific journeys will have their fares refunded.

TfL said that cross-river bus travel had gone up from 2,700 passengers per day before the Silvertown Tunnel opened, when only the 108 through the Blackwall Tunnel was available, to 10,400 with all three buses and two tunnels.
On other services, fares will be frozen until July 7, though fares on the Tube, DLR, Elizabeth Line and London Overground in SE London will be increasing by an average of 5.8 per cent from March 1 as a condition of its funding deal with the government.
National Rail fares – including Southeastern and Thameslink – will be frozen, as will travelcards and Oyster and contactless fare caps.
While passengers will be able to travel to and from North Greenwich free on the 108 and 129 until late May, there is less good news for passengers on another route serving the station: the 486 will be cut in frequency from Saturday, from six buses an hour to five.
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