Over the same time period, SUV and pickup truck sales have skyrocketed. In 2009, pickup trucks, SUVs and vans accounted for 47 per cent of all US new vehicle sales, according to Motorintelligence.com. Last year, light trucks were more than three-quarters of new vehicle sales.
Not all SUVs and pickup trucks have the blind spots, though. Compact SUVs, for instance, are now the largest part of the US market.
The study also found that the larger vehicles were more likely than cars to be involved in crashes where pedestrians were standing, walking or running near the edge of the road and away from intersections.
Researchers studied federal crash statistics in which pedestrians were killed, as well as all pedestrian crashes reported to police in North Carolina from 2010 through 2018.
The North Carolina statistics showed that pickups were 42 per cent more likely than cars to hit pedestrians while making left turns. SUVs were 23 per cent more likely to hit people than cars. There was no significant difference in the odds of a right turn crash for the different types of vehicles, the study showed.
Outside of intersections, pickups were 80 per cent more likely than cars to hit a pedestrian along the road. SUVs were 61 per cent more likely, and minivans were 45 per cent more likely to hit people than cars, IIHS said.
Trucks, SUVs and vans typically have thicker "A-Pillars" than cars because of federal roof-strength standards to prevent collapse in rollover crashes, the IIHS said. The pillars typically are wider because they have to withstand the higher weights of the bigger vehicles.
And the pillars aren't the only things creating blind spots in the bigger vehicles. Consumer Reports found last year that high hoods also obstructed driver views of pedestrians crossing in front of the vehicles.
"To see over that high hood, you're going to be looking further down the road," said Jennifer Stockburger, director of operations at Consumer Reports' car test centre.
The magazine and website found that pickup truck hood heights have risen 11 per cent since 2000. The hood of a 2017 Ford F-250 heavy-duty pickup was 55 inches (1.4m) off the ground, as tall as the roofs of some cars, Stockburger said.
Ford, General Motors and Stellantis, which sell the bulk of the large SUVs and pickups in the United States, all declined comment on the study. Messages were left seeking comment from Auto Innovators, an industry trade group.
Carmakers could use stronger metals to make the A-Pillars smaller and increase visibility, said Wen Hu, an IIHS senior transportation engineer and another study author. "These larger vehicles, they need stronger pillars, we all understand that," she said. "Increasing the size of the A-Pillar is not the only way to increase the strength."
IIHS, which is funded by car insurance companies, studies vehicle safety.
Stockburger said the industry could also examine sight lines on the bigger vehicles, as well as add automatic emergency braking systems that detect pedestrians.
Most carmakers have promised to make automatic emergency braking standard equipment on nearly all of their new models by September of this year. In addition, federal safety regulators are proposing to make the systems mandatory on all new vehicles.
-AP