Madison restricts unnecessary motor-vehicle idling, particularly for diesel trucks and buses near schools, hospitals, and residential buildings, to reduce particulate exposure and align with the Climate Action Plan's air-quality goals.
Madison General Ordinances and supporting Wisconsin DNR rules limit idling of heavy-duty vehicles to roughly five minutes when stopped, with exceptions for traffic, safety equipment, refrigerated cargo, and extreme temperatures. Madison Metro buses and city fleet vehicles operate under stricter internal idling-reduction policies. Construction contractors on city projects must post idling notices and train operators. Schools served by Madison Metropolitan School District follow statewide anti-idling guidance for buses. Enforcement is handled by Madison Police Department traffic officers and Building Inspection on construction sites, coordinated with Wisconsin DNR for diesel emissions complaints.
Citations typically run $50-$200 per occurrence, with higher penalties for repeated diesel idling near schools or hospitals; construction-site idling violations can also trigger stop-work notices on city projects.
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