So a Boise woman has a new invention to keep bicyclists safer on the roadways.
It's an invention by Jeri Rutherford, of Rideout Technologies.
She's trying to prevent more people from being injured or killed when they bike around town.
They're called the Firefly, and they're lighted turn-signal, handlebar grips.
The grips are shockproof, waterproof and made of soft rubber.
After you turn on the LED lights with your thumb on each grip, they automatically turn off after 30 seconds.
Or, bicyclists can push the button for a second time.
Rutherford has a strong personal connection for wanting bicyclists to stay safe on the roadways.
"I got hit by a car," she said. " I got hit by an elderly woman who simply did not see me, and it wasn't serious, but it brought to mind how easy it is to lose a bicyclist on the side of the road."
Rutherford points out that commuters bicycle to work at the most dangerous times on the roadways: dawn and dusk.
The Idaho Transportation Department's data shows that in 2012, the number of bicycle crashes increased by 12 percent, from 346 the previous year to 389.
Of all the bicycle crashes in 2012, 18 percent were between the ages of four and 14.
You can buy the Firefly at McCu's on Bogus Basin Road or through the website of Rideout Technologies.
They cost $37.50.