MI HB5962

Replaces the existing joint determination requirement for state trunk line highways with a requirement that the state transportation department and department of state police jointly determine modified speed limits based on the eighty-fifth percentile of free-flowing traffic under ideal conditions.

Establishes that speed limits must be set at the eighty-fifth percentile speed rounded to the nearest 5 mph increment, with a minimum floor of the seventy-fifth percentile speed, and allows advisory signs when highway features have lower design speeds.

Changes county highway speed limit determinations from requiring unanimous agreement among county road commission, township board, and state police to requiring joint determination only between the county road commission and department of state police.

Requires traffic control orders establishing modified speed limits to be filed with the appropriate county clerk or local office and permits certified copies to serve as evidence in courts of the authority for issuance.

Defines key terms including "county road commission," "design speed," "local road authority," and "traffic control order" to clarify the application of speed limit procedures across different types of roads and jurisdictions.