London Buses route 108 is a Transport for London contracted bus route in London, United Kingdom. The service is currently contracted to East Thames Buses. The 108 is considered to be one of London's most difficult routes to operate, and is said to be agonisingly slow for a through journey from Lewisham to Stratford, taking just under an hour. This journey is now also covered by the Docklands Light Railway in offpeak times, taking about half as long, but via Greenwich and the Docklands rather than Blackheath and the Blackwall Tunnel. The unusual feature of the route is its use of the Blackwall Tunnel, which has a lot of traffic at the best of times; regular tunnel closures and maintenance work also cause service delays and interruptions.