Since the 240 was the only model fully affected by this regulation, I figure that would make this forum the most appropriate place to post my question.

I've always wondered why Volvo included 85 mph speedometers in some cars and didn't use 120 mph ones in all of them, particularly since (I think) the old-style instrument clusters *did* read over 85 mph. While reading today, I discovered that the reason for 85 mph speedometers was (surprise) US regulations. Apparently a law took effect in 1982 that mandated a top indicated speed of 85 mph. It seems that it was repealed or universally ignored no later than 1984, when Volvo again began installing 120 mph speedometers in their cars.

So, if you've got a US-spec Volvo built between 1980 and 1984, it should have an 85 mph speedometer in it. Does anyone have a Volvo from another model year that has this speedometer? I had initially thought that the 120 mph speedo was a GL "upgrade"--is there any truth in that?

Finally, most importantly, what was the reason for this limit? I've done some cursory research, but I haven't found any indication as to why this nonsensical law was put into place.
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'89 244 GL -- 111,005 miles (see profile for info on car)