Truck yard and plant site security in Sarnia

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Chemical Valley and the Blue Water Bridge crossing

The Blue Water Bridge carries Highway 402 across the St. Clair River to Michigan, and for every month of 2025 it carried more commercial truck traffic than Windsor's Ambassador Bridge, logging 2.1 million truck trips for the year. Chemical Valley, Sarnia's petrochemical complex of more than 60 operations including Imperial Oil, Suncor and NOVA Chemicals, generates tanker and hazmat freight that needs carriers with the right equipment, and business parks such as the 402 Business Park and the HWY 40 Industrial Park sit within minutes of the bridge.

Vehicles and loaded trailers at Sarnia-area businesses have been taken straight off the lot. On March 6, 2026, Sarnia Police reported that video surveillance captured someone driving onto a London Line property, getting into a parked pickup truck and driving off hauling its attached enclosed trailer, which carried a Ventrac tractor and tools; the truck was later found in a ditch in Comber and the trailer and its contents were recovered in the Toronto area. Days later, Lambton OPP investigated a similar theft of a utility trailer from a business in Camlachie.

Sigma watches a Sarnia plant yard, carrier lot or warehouse the way Chemical Valley runs: without a break. AI person and vehicle detection flags anyone hooking up to a trailer or moving along the fence line after hours, and a live agent checks the camera, gives a live, instant talk-down through the site's speakers and calls Sarnia Police or Lambton OPP if the person doesn't leave. Yard checks add parking reports and visual seal checks on video for trailers waiting on the lot.

Also covering Point Edward, Corunna, Camlachie, Petrolia, Courtright, Mooretown, Brights Grove, Wyoming.