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LIVERPOOL, N.Y. -- Work is underway on the Onondaga Lake Parkway to install a new warning system to help keep over-height vehicles off the road.

The system is being put up following a study recommending several changes on the parkway, which began after a Megabus crashed into the low bridge on the road last year, killing four people.

New warning messages and rumble strips have already been added to the Parkway.

State Department of Transportation officials say the new warning system will consist of a laser beam and receiver and a pavement detector in each lane. When a vehicle interrupts the beam and triggers the detector, roadside signs will flash a message warning the driver to stop and a notification will be sent to the Onondaga County 911 center.

Crews are currently installing wiring and there will be some short-term lane closures over the next few weeks as they put up the rest of the system. It's expected to be fully up and running by this fall.