The new lighting systems features these design innovations …
An astronomical clock used for light control, in lieu of photocells, for more precise, reliable lighting control and improved energy savings.
LED tunnel lights with 25 percent more lumen output reducing the actual number of tunnel lighting fixtures needed by 20 percent. Using high-efficiency LED fixtures increases energy savings.
Tamperproof covers on handholes, heavy concrete lids on pull boxes, continuous steel collars around frangible bases – all three of these innovations -- plus the use of aluminium cabling instead of more valuable metals – act as theft deterrents to help keep the new system safe and in good repair.
The contract between FLP and MDOT is 15-years-long with the work divided into two phases. The first two years are devoted to Design & Construction (D&C), and the remaining 13 years are dedicated to Operation & Maintenance (O&M).
The D&C phase, from August 2015 to August 2017 focused on designing and installing the improved freeway lighting system. This included the design and improvement of new lighting and non-lighting elements, along with new and existing infrastructure.
FLP began by conducting an extensive survey of the old lighting system. The purpose was to …
Identify non-working panels and circuits
Locate panels and provide each one with a GPS reading
Note any visible corrosion on panels
Evaluate condition of circuit wiring
Evaluate condition of the panel feeders
Identify missing wiring (due to theft)
Document condition of raceways and handholes
Identify foundations with missing poles and evaluate foundation condition
Evaluate condition of poles and note any corrosion
List all foundations requiring repair
Document age / condition of fixtures
Replacing missing fixtures and repairing and/or replacing circuits and panels in the worse areas was the top priority. Then the focus moved to replacing existing median and ramp fixtures.
Year two D&C focused on replacing median and ramp fixtures, high mast fixtures and finally tunnel fixtures.
Installed 5,961 new mainline and ramp fixtures, 2,480 high mast fixtures, 2,665 tunnel fixtures, 269 underpass fixtures and 337 poles. 205 damaged circuits were repaired, and 205 time clocks and 9 tunnel controllers were installed.
D&C was completed in August 2017. The system is now fully operational and will be fully maintained through the remaining 13 years of the current FLP/MDOT contract until August 2030.