Fortunately, the National Highway Traffic Safety Administration has weighed in on the matter, and issued guidelines (PDF) for the installation of such barriers. This should make it easier to boost school bus safety during the pandemic, with a minimum of extra expenditures.
The NHTSA OKs Plastic Disease Barriers On School Buses
The NHTSA's letter addresses two different types of barriers. One is a larger plexiglass barrier which is installed around the driver's seat, both behind them and to their right, which effectively creates a small cabin. The other type of barrier is described as plastic "soft shields" which attach to the roof of the bus and hang behind each passenger seat, creating a barrier between riders.
Their primary concern is that these barriers conform to several specific Federal Motor Vehicle Safety Standards (FMVSS) which are relevant to maintaining school bus safety with these additions.
In the letter, the NHTSA also mentions that they are only responding to a specific inquiry, and consider the letter to be advisory in nature. It doesn't constitute any change to the current school bus safety regulations, nor does it imply that districts should feel compelled to implement these barriers.
It does, at the least, officially clear the way for schools to implement barriers if they wish, so long as they are careful to adhere to the mentioned safety standards.
Are Barriers The Right Solution?
With most experts predicting that the coronavirus will remain a threat well into 2021, there's a strong argument to be made for these barriers being a cost-effective upgrade.
Is this something your district is considering, or has already done? Let's talk about it in the comments.