In 1974, the interior of the Transit Coach underwent a revision, with a molded-fiberglass dashboard replacing the previous all-metal design. To improve driver ergonomics, key switches were relocated from under the steering wheel onto a single control panel left of the driver; many full-size school buses use this layout to this day. In states outside of California, amber warning lights began to be phased in as a requirement alongside the red warning lights (seen since the 1940s); in 1975, the Transit Coach was offered with amber warning lights for the first time (to meet Washington State specifications).
