When I went thru Montana in the spring of '96 (by bus, ugh), there was no set speed limit for cars. At night, all vehicles had to obey a speed limit of 65mph and during the day, trucks had a 65mph speed limit. For all other vehicles, the daytime speed limit was whatever could be considered "reasonable and prudent"; so if you wanted to go 110mph it would only take you about 7 hours to make it through Montana on I-90. The phrase "reasonable and prudent" allowed for prosecution such as when driving above the speed limit deemed safe for non-car vehicles during bad rain or snow. In May of '99, Montana changed their maximum speed limit to 75mph.
http://img.gawkerassets.com/img/186lzd4j8zkp5jpg/ku-xlarge.jpg

Gotta love that 'reasonable and prudent' caveat considering any cop on any day can decide that for you.

Handy Tip #87364: As a buffer to speeding or (other) citations, carry about ten used asthma inhalers in your on-board bag-o-tricks and when a cop pulls you over, dump 'em out on the passenger seat and floorboard and start hyper-ventilating through a paper bag as he approaches your vehicle.

Way to work the soft-tissue if they have any, a decent cop will give you directions to the closest drug store and let you go without a warning...

(I also keep live hornets in the trunk with a quick-release latch for similar, uncomfortable occasions).

On a similar side note, I've always wanted to release a couple hundred glow-in-the-dark hi-bounce balls into traffic at night on the DC beltway.

*dead

Invocations (dead) cannot be called by walle because walle is not privileged - sorry.

*dead on DMCA grounds

This video has been declared non-functional; embed code must be fixed within 2 days or it will be sent to the dead pool - declared dead by Payback.

Thanks @walle and @Payback It's fixed now.

https://www.youtube.com/watch?v=dU97w2DH5mc