Metropolitan District Police yesterday began to install glass reflectors on Memorial Drive, to warn motorists of dangerous curves and cut-offs.

The reflectors, which stand 26 inches off the ground, will be installed to beyond the Fresh Pond Parkway on the Cambridge side, and from Fresh Pond Parkway to beyond Weeks Bridge on the inbound traffic side.

According to police officials, the Massachusetts Department of Public Works is setting up these reflectors, or "delineators," throughout the state. Local officials decided last fall to install them, but the reflectors arrived only recently.