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Hybrid transit buses using the GM-Allison Two-mode hybrid system are becoming fairly common in North America with several thousand now on the road. In the UK however, the two-mode buses are brand new, with the first four recently going into service in London. The two-mode hybrid transmissions are installed in Optare Tempo bus chassis that are being used as part of a hybrid test program in the British capitol. Several different hybrid systems are being evaluated by Transport for London.

During his keynote at the Consumer Electronics Show, GM Chairman Rick Wagoner announced that the 1,000th transit bus equipped the the GM-Allison Two-Mode system would delivered this month and it was coming to Las Vegas. Las Vegas is doubling their hybrid fleet from thirty to sixty buses. The hybrid bus powertrain was introduced in 2003 and in 2007 over 400 of them were produced. So far the Seattle King County Metro Transit Authority has made the biggest commitment to the system, ordering 500 of