One of the many proposed rules published a few days before President Trump took office was a mandate that all cars built after 2020 come with dedicated shortrange radio communications (DSRC) so that they can talk with one another. According to the National Highway Traffic Safety Administration (NHTSA), this rule will “prevent hundreds of thousands of crashes.” The rule is downloadable as a 166-page Federal Register document or a slightly more readable 392-page paper.
The mandate would add about $300 to the cost of every car, or several billion dollars a year. The radios would not add much weight to the cars, but once most cars have them the collective weight would increase fuel consumption by more than 30 million gallons a year.
In exchange for these costs, NHTSA estimates that the rule will save 23 to 31 lives by 2025. These numbers are small because the benefits of vehicle-to-vehicle (V2V) communications are nil unless both vehicles in a potential communication have them. Since the average car on the road is more than 11 years old, it will take about that many years before most cars have V2V and many more years before nearly all cars have it. Yet even by 2060, NHTSA projects the technology will save only 987 to 1,365 lives.