The Federal Motor Carrier Safety Administration has rejected Boston's request to route trucks carrying hazardous materials around the city
, according to American Trucking Associations.

In 2006, Mayor Thomas Menino's administration halted all daytime permits for trucks passing through Boston with hazardous or flammable materials, reports the Boston Globe. But the federal government must approve hazmat routes, and Boston never consulted the Department of Transportation about it.

In November 2009, the FMCSA issued a pre-emption determination, which said "This de facto modification to the city's routing designation . . . serves to shift the risk associated with that transportation to neighboring jurisdictions by forcing hazardous material motor carriers to use alternative routes bypassing the city of Boston."

Boston then requested a nine-month extension, which FMCSA denied. The pre-emption determination will now take effect May 17, the ATA said.