Municipal Liability Expert Series: MVAs - A Collision Course on Liability

Rising Risks in Road Liability

Municipalities in Ontario bear statutory responsibility under the Municipal Act, 2001 to keep highways in reasonable repair, including addressing hazards like ice, snow, potholes, and signage issues that contribute to motor vehicle accidents. A key shield against liability is compliance with the province's Minimum Maintenance Standards (MMS), which set specific timeframes and methods for winter maintenance, pothole repairs, and surface treatments.

Recent scrutiny has focused on proposed revisions to these MMS, which promise to tighten requirements and better reflect modern realities such as more frequent extreme weather. These updates, while aimed at improving safety, would force municipalities to allocate more resources to road upkeep or face heightened vulnerability when accidents occur on allegedly substandard roads.

The stakes are concrete and growing. Municipalities are routinely added to MVA lawsuits as deep-pocket defendants, even when primary fault lies with drivers, because public insurance pools offer larger potential recoveries than individual motorists. This practice drives up legal defense expenses and contributes to surging liability insurance premiums—often 20-30% or more in recent hard-market conditions influenced by inflation, climate-related claims, and rising award sizes.

Non-obvious tensions arise between fiscal constraints and safety mandates. Many municipalities struggle with aging infrastructure and limited budgets, yet inaction or inadequate documentation can eliminate the MMS defense entirely, leaving them fully exposed. Courts have upheld MMS compliance as a complete bar to liability in past cases, but plaintiffs increasingly challenge whether standards were truly met or whether municipalities took reasonable additional steps beyond the minimum.

Extreme weather adds another layer: declarations of 'significant weather events' can temporarily lower required standards during storms, but such declarations are contestable and do not provide blanket immunity. With climate patterns intensifying, the frequency of such events—and related accidents—pushes municipalities toward more proactive, costly maintenance to mitigate risks.