Belmont police are joining a growing number of communities participating in the Blue Envelope Program, a state initiative to foster a “safer and more understanding environment” for drivers with autism spectrum disorder or other neurodiversities. As part of the program, drivers can now place their license and vehicle registration in blue envelopes, which are now available at the police station on Concord Avenue. The envelopes indicate to responding officers at traffic stops that the driver has autism spectrum disorder. “This…