Monitor-Merrimac Bridge Tunnel VMS sign replacement

This project called for the replacement of 26 of the variable message signs at MMMBT and the conversion of the remaining eight to emergency use. The project required the development of a replacement VMS controller, which runs multiple communications protocols, interfacing to the old and the new signs on the same multi-drop 2400 baud serial line, and updates the signs once per second. The controller replacement was implemented using Intellution iFIX. Completed 2001.