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In page Ultra Low Emission Zone:

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Vehicles in the "disabled" tax class are exempt from the charge, as are London-licensed taxis, private hire vehicles which are wheelchair accessible, and historic vehicles (over 40 years old). There are also exemptions for agricultural vehicles, military vehicles, certain types of mobile cranes and non-road going vehicles which are allowed to drive on the highway (e.g. excavators).[1] Residents of the zone did not pay the charge until October 2021,[2] provided they were registered for the residents' Congestion Charge discount and met the T-Charge standards[citation needed].