Montana Department of Transportation (MDT)

• https://www.511mt.net
• It looks like they use the same map provider setup that South Dakota DOT uses.

Road Weather Information System (RWIS)

Montana's Road Weather Information System (RWIS) consists of strategically located sites across the state which provide accurate, real time weather information as well as camera imagery. - https://www.mdt.mt.gov/travinfo/weather/rwis.aspx - https://app.mdt.mt.gov/atms - "Road Weather API": Swagger API documentation link on parent page for RWIS data and camera imagery.

Other cameras

https://www.mdt.mt.gov/travinfo/weather/camera-other.aspx