Specifications include, but are not limited to: The Contractor shall provide their technical and performance proposal for Forty (40) foot Battery Electric Buses which shall be used on urban arterial streets. Buses shall have a minimum expected life of twelve (12) years or 500,000 miles, whichever comes first, and are intended for the widest possible spectrum of passengers, including children, adults, the elderly and people with disabilities. Curb weight of the bus shall be minimized to the extent practical without compromising its integrity and/or durability. It shall be a design goal to construct each bus as light as possible without degradation to safety, appearance, comfort, traction or performance. Additional consideration will be given to manufactures which demonstrate a clear commitment to reducing overall curb weight.