What was Reasonable and Prudent?

Basic Rule Speed Restriction

Motorists were to comply with the "basic rule" speed limit when they drove, in a manner that did not unreasonably endanger other highway users. To ensure this, drivers were to be constantly alert to changing traffic conditions and adjust their speed as conditions varied. These conditions were numerous and could change rapidly. Thus drivers were to be alert for:

Driving in a careful and prudent manner, complying with the basic rule, required drivers to be constantly alert and mindful of their personal responsibility not only for their own safety but also for that of other highway users.

Montana Speed Limit Table
Speed Related Traffic Laws and their Fines

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