ACCORDING to data gathered by the Centres for Disease Control (CDC), deaths caused by cars in America are in long-term decline. Improved technology, tougher laws and less driving by young people have all led to safer streets and highways. Deaths by guns, though—the great majority suicides, accidents or domestic violence—have been trending slightly upwards. This year, if the trend continues, they will overtake deaths on the roads.

The Centre for American Progress first spotted last February that the lines would intersect. Now, on its reading, new data to the end of 2012 support the view that guns will surpass cars this year as the leading killer of under 25s. Bloomberg Government has gone further. Its compilation of the CDC data in December concluded that guns would be deadlier for all age groups.

Comparing the two national icons, cars and guns, yields “a statistic that really resonates with people”, says Chelsea Parsons, co-author of the report for the Centre for American Progress. Resonance is certainly needed. There are about 320m people in the United States, and nearly as many civilian firearms. And although the actual rate of gun ownership is declining, enthusiasts are keeping up the number in circulation. Black Friday on November 28th kicked off such a shopping spree that the FBI had to carry out 175,000 instant background checks (three checks a second), a record for that day, just for sales covered by the extended Brady Act of 1998, the only serious bit of gun-curbing legislation passed in recent history. Many sales escape that oversight, however. Everytown for Gun Safety, a movement backed by Mike Bloomberg, a former mayor of New York, has investigated loopholes in online gun sales and found that one in 30 users of Armslist classifieds has a criminal record that forbids them to own firearms. Private reselling of guns draws no attention, unless it crosses state lines. William Vizzard, a professor of criminal justice at California State University at Sacramento, points out that guns also don’t wear out as fast as cars. “I compare a gun to a hammer or a crowbar,” he says. “Even if you stopped making guns today, you might not see a real change in the number of guns for decades.” Motor vehicles, because they are operated on government-built roads, have been subject to licensing and registration, in the interests of public safety, for more than a century. But guns are typically kept at home. That private space is shielded by the Fourth Amendment just as “the right to bear arms” is protected by the Second, making government control difficult.

Car technologies and road laws are ever-evolving: in 2014, for example, the National Highways Traffic Safety Administration announced its plan to phase in mandatory rear-view cameras on new light vehicles, while New York City lowered its speed limit for local roads. By contrast, safety features on firearms—such as smartguns unlocked by an owner’s thumbprint or a radio-frequency encryption—are opposed by the National Rifle Association, whose allies in Congress also block funding for the sort of public-health research that might show, in even clearer detail, the cost of America’s love affair with guns.