WASHINGTON (AP) — After a drunken driver on a California highway back in 1968 slammed into a bus carrying passengers to Las Vegas, killing 19, investigators said a lack of seat belts contributed to the high death toll. But 45 years later, safety advocates are still waiting for the government to act on seat belts and other measures to protect bus passengers.

Over the years, the National Transportation Safety Board has repeated its call for seat belts or some other means to keep passengers in their seats during crashes involving the large buses used for tours, charters and intercity passenger service. About half of all such motorcoach fatalities are the result of rollovers, and about 70 percent of those killed in rollover accidents were ejected from the bus.