April 25, 2016 | Washington, DC
The Notice of Proposed Rulemaking (NPRM) specifies a new impactor test on the glazing material of side and rear windows and glass panels on the roof of motorcoaches and large buses. The test simulates an unbelted occupant impacting a window on the opposite side of the bus during a bus rollover crash. The proposal would drive the installation of advanced glazing and improved emergency exit latches in motorcoaches and large buses.
Preventing occupant ejection is a high priority for the DOT and NHTSA, as noted in the DOT Motorcoach Safety Action Plan. NHTSA has taken a multifaceted approach to addressing this safety problem. In 2013, the agency issued a final rule requiring seat belts at all seating positions in motorcoaches to mitigate occupant ejection and improve crash protection.
In 2014, NHTSA issued an NPRM for improved rollover structural integrity that would also ensure window glazing does not pop out of its mounting and emergency exits do not open inadvertently during a rollover crash. NHTSA is now proposing performance requirements for preventing the windows and roof panels themselves from becoming ejection portals due to occupant loading during a rollover crash.
NHTSA is also proposing to improve emergency exits in motorcoaches and large buses by requiring that emergency exit latches remain operable after the proposed impact tests and by limiting the protrusions of emergency exit latches into emergency exit window openings to ensure they do not unduly hinder emergency egress.
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