WASHINGTON — A study by State Farm for the Governors Highway Safety Association warns about the rising number of bicyclist deaths and offers recommendations to improve safety when cars and bikes share the road.

“We’ve got fatalities going up after a period of decline,” said Chris Mullen, director of technology research at State Farm. “In 2015 (the latest year data are available), over 800 bicyclists were killed, and that’s up over 12 percent from the previous year.”

Percentage-wise, bicyclists had the largest increase of fatalities among all the roadway user groups, including drivers and pedestrians.

In crashes with motor vehicles, 85 percent of the cyclist killed are men. The average age of victims is 45 years old.

The research also shows that most fatal crashes — 53 percent — happen at night between 6 p.m. and 6 a.m., with 72 percent occurring outside of intersections.

“The motorist typically doesn’t see the bicyclist,” Mullen said.

The study, called “A Right to the Road: Understanding and Addressing Bicyclist Safety,” offered 30 recommendations to boost safety. Among those are better training for law enforcement to understand laws meant to protect cyclists.

D.C.’s bike laws received praise in the report.

“They have the 3 feet passing law,” Mullen said. “D.C. has a well-structured where-to-ride law and a texting ban for bicyclists.”