Speed limits

Took a little bit of research to answer this question, thanks to our friends at the Engineering department for helping answer this one! 
“Here is a brief history of the process for implementing the 90 km/h speed limits:
 In 2002, Chatham-Kent Council directed engineering staff to review Chatham-Kent roadways for 90 km/h speed limits. A study was conducted to review roadways that would meet geometric standards for 90 km/h speed limits. Other safety factors such as roadside obstructions, land development, and operating speeds were also reviewed. In 2003 a report for Phase 1 of the study was delivered to Council which recommended former Ministry of Transportation highways (Hwy 2, 3, 21, 40, 78, 79) for 90 km/h speed limits, subject to receiving budget funding for adjusting road signs for the new speed limit. Council removed some recommended roadways from the list, including Irish School Road (CK #21 north of Dresden) and Talbot Trail (CK #3) between Cedar Springs and Wheatley. In 2008 the funding was approved, a by-law was passed, and the 90 km/h speed zones were implemented.
 In 2003, Council directed staff to review additional roadways and therefore the former County of Kent roadways were reviewed as part of the Phase 2 study. Using the same criteria as for Phase 1, a list of recommended roadways was presented to Council. Many of the former Kent County roadways failed the evaluation. Some former MTO highways, such as Longwoods Road (CK #2) east of Thamesville, Irish School Road (CK #21) were upgraded with new asphalt surfaces, were re-evaluated, and were recommended for 90 km/h speed limits.
The Phase 2 roadways were by-lawed in 2014 and funding was approved in 2016 to implement the 90 km/h speed zones.
The final 90 km/h roadways were implemented in 2018 and no further roadways are planned for review.”