Window Woes Denied: NHTSA Rejects Safety Waiver for 15,000 Aging Buses
Published Date: 12/3/2025
Notice
Summary
Motor Coach Industries (MCI) found that over 15,000 of their buses made between 1988 and 2022 didn’t fully meet window safety rules. MCI asked the government to ignore this issue, saying it’s not a big safety risk, but the National Highway Traffic Safety Administration said no. This means MCI can’t skip fixing or notifying owners about the problem, which could affect costs and timing for repairs.
Analyzed Economic Effects
2 provisions identified: 0 benefits, 1 costs, 1 mixed.
Window Glazing Fails Light Standard — Safety Risk
NHTSA found that the curb-side lower front-door windows on the affected coaches use AS-5 glazing instead of AS-1 or AS-2 and that measured luminous transmittance for that glazing was approximately 20% versus the 70% figure in ANSI/SAE Z26.1-1996. NHTSA concluded this reduced transmittance and the AS-5 glazing’s lack of other AS-2 performance tests could reduce driver visibility in low-light or poor-weather conditions and could be especially consequential if a small child or animal is outside the coach during reduced ambient lighting.
Recall Required — MCI Must Notify and Fix
NHTSA denied Motor Coach Industries' petition, so MCI must provide notification and a free remedy under 49 U.S.C. 30118 and 30120 for approximately 15,454 coaches manufactured between January 4, 1988 and January 14, 2022. The affected models include multiple J-, D-, E-, 102-, and MC-series coaches listed in the notice. This denial means owners/operators can expect formal recall notices and manufacturer-funded repairs, which could still affect the timing or availability of those coaches while repairs occur.
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