Buses Get Bulletproof Windows to Keep Riders Inside During Crashes
Published Date: 1/15/2026
Rule
Summary
Starting October 30, 2027, big buses like motorcoaches must have special windows designed to keep passengers from being thrown out during crashes. The new rule updates window size rules and testing details to make these safety features clearer and stronger. Bus makers have until then to comply, with early adoption encouraged—keeping riders safer without breaking the bank.
Analyzed Economic Effects
4 provisions identified: 3 benefits, 1 costs, 0 mixed.
Which buses must add anti‑ejection windows
The rule requires "advanced glazing" (anti-ejection windows) on over-the-road buses (motorcoaches) and other large buses with GVWR greater than 11,793 kilograms manufactured on or after October 30, 2027. The standard does not apply to school buses, transit buses, prison buses, or perimeter-seating buses.
What the glazing must resist in tests
Under the standard, glazing must prevent displacement past a defined ejection reference plane, stop passage of a 102-millimeter (4 inch) diameter sphere after an impact, and leave emergency exits operable following the impact tests that simulate an unrestrained adult thrown in a rollover.
Compliance deadline for bus manufacturers
Manufacturers must comply with FMVSS No. 217a by October 30, 2027; the rule is effective January 15, 2026 and optional early compliance is permitted. The standard includes a minimum daylight opening threshold of 279 millimeters for when impact tests apply.
Clarifications that ease compliance
NHTSA revised the rule text to add an illustrative daylight‑opening figure, changed the minimum‑size wording to apply to the daylight opening (279 mm threshold), replaced "discrete attachment point" with a defined "latch attachment point," and clarified which interior items (e.g., restraining barriers are excluded; stanchions and polycarbonate shields are included) count toward the daylight opening periphery. These clarifications are effective January 15, 2026.
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