Specifications include, but are not limited to: 6.4.1The barrier must be designed to protect the operator from physical assaults by passengers including thrown objects, spitting, punching, or other forms of physical altercations.6.4.2The barrier must be lockable to prevent entry by unwanted persons.6.4.3The barrier must include a window thatcan be opened by the operator to facilitate communication and interaction between the operator and passengers at the operator’s discretion. The window shallbe electrically operated and must be automotive grade anti-glare laminated safety glass. Plexiglaswill not be accepted.The electrically operated window shall include automatic-up and automatic-down features.6.4.4The barrier must allow sufficient airflow to the driver to ensuretheHVAC workseffectively in the operator’s area.To optimize air flow, the barrier shall incorporate one or more variable speed fans, controllable by the operator.6.4.5The barrier must allow the operator to maintain visual contact with the passenger area of the bus.