An image from a letter posted by Derby police on Facebook.

DERBY — The state Department of Transportation sent a letter Oct. 29 saying speed cameras were coming to Route 34 as of Nov. 1.

The letter was addressed to Mayor Joseph DiMartino and shared on Facebook by the Derby Police Department.

An image shared by police is posted at the top of this story.

The work zone speed cameras are expected to be on Route 34 for two weeks.

The cameras have the power to issue infractions or warnings, according to the letter, citing state law.

There is ongoing construction on Route 34 in the area across from Crystal Cleaners at 1 New Haven Ave.

The image of the letter did not provide details of the ongoing road work.