In what I think is an under-reported story, the U.S. Department of Transportation’s National Highway Traffic Safety Administration (NHTSA) issued a final rule requiring rear visibility technology in all new vehicles under 10,000 pounds by May 2018.
It's hard to say how much this rule will help your average adult cyclist (backing up fatalities are only about 1% of all bike fatalities), but it is a much larger factor in fatalities involving child cyclists.
On average, there are 210 fatalities and 15,000 injuries per year caused by backover crashes. NHTSA has found that children under 5 years old account for 31 percent of backover fatalities each year, and adults 70 years of age and older account for 26 percent.
And, it may be a bigger problem than thought because many of these are not reported in FARS data
While the FARS database is a census of motor vehicle crashes, it only catalogues crashes that are related to a public road. If a fatal crash occurs entirely on private property, (e.g., in a driveway, parking lot, on a farm) it will not be included in the FARS, in accordance with the criteria defining FARS cases. Likewise, if a motor vehicle related injury or property damage only crash occurs, several factors may cause the case to not appear in any database. These include the lack of a police report, a lack of insurance involvement, and a lack of documentation regarding medical treatment. In addition, NASS-GES does not include certain cases because they do not fit the definition of a traffic crash. Thus, we not only lack information regarding backover fatalities, but also backover crashes occurring on private property that result in injuries and property damage
So the number of cyclists deaths from car collisions are unreported every year because they don't include this kind of crash. But these new rules are expected to reduce the number of backover crashes and that's good news.
Including vehicles that already have systems installed, 58 to 69 lives are expected to be saved each year once the entire on-road vehicle fleet is equipped with rear visibility systems meeting the requirements of today's final rule.