ULEZ checker

The ULEZ checker determines whether a given vehicle is compliant with Ultra Low Emission Zone rules for UK locations based on vehicle_class, engine_type, registration_year, and postcode. Target users include private car owners, fleet managers, rental agencies, and trip planners who operate in or through ULEZ zones. It applies widely cited Euro emission threshold rules to provide a transparent, reproducible assessment of eligibility and potential daily charges, enabling proactive vehicle selection, route planning, and compliance budgeting.
Core Logic is deterministic: petrol vehicles are compliant if registered from 2006 onward, diesel vehicles if registered from 2015 onward, and fully electric powertrains are treated as compliant by default. Plug-in hybrids follow the same thresholds where defined. Location data from postcode identifies whether the vehicle would incur a charge. When inputs are missing or outside the UK context, results indicate unknown or non-applicable to avoid misleading conclusions.
Outputs include is_ulez_compliant (boolean), ulez_zone_name (string or null), daily_charge_gbp (numeric). The tool also returns a recommended next step and a confidence note for uncertain cases. It supports quick checks for single trips or long-term policy decisions and is designed for rapid, reproducible assessments that can be exported to records or reports.
Core features support pre-purchase checks, route planning, and policy enforcement for fleets, providing a clear, auditable view of compliance risk and costs.