More than half of highway workers polled reported that vehicles had crashed into their construction work zones in the past year, according to results of a new national highway work zone study by the Associated General Contractors (AGC) of America and HCSS released Thursday.

“Elected and appointed officials are not doing enough to protect workers and motorists in highway work zones,” said Ken Simonson, the association’s chief economist and author of the annual survey. “Our transportation networks may be invaluable, but the lives of workers and motorists are priceless.”

According to the survey results, motorists are in even greater danger from highway work zone crashes than construction workers, Simonson noted. Twenty-eight percent of contractors participating in the survey experienced crashes that resulted in injury to construction workers. But more than twice as many firms—59 percent—reported experiencing a crash in which drivers or passengers were injured.