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I was just thinking about why many corners have advisory speed limits that are less than the highway speed limit, does it have to do with centripetal acceleration?

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  • $\begingroup$ Reduced forward vision around the corner is sometimes a factor in vehicle speed reduction... $\endgroup$ – DJohnM Nov 13 at 19:37
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It has to do with this:

In a perfect world, turns would all be banked so you could traverse each at full speed and not skid sideways off the road. Since it is not always possible to bank the roadway surface at the right angle to support a full-speed turn, the reduced speed limit in a turn is set to accommodate the existing bank angle and turn radius minus a safety factor which includes wet pavement, bad driving habits, and poor tires.

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  • $\begingroup$ Going into a banked turn at less than the physically appropriate speed puts extra demands on road/tire friction... $\endgroup$ – DJohnM Nov 13 at 19:35
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Yes. There is a maximum acceleration that your tires can provide.Be careful with sharp turns at high speeds where the centripetal acceleration is close to this limit. Any additional acceleration (or breaking) may cause the vechicle to slip out of the turn.

If you decrease your speed, centripetal acceleration decreases and you will be more safely within the capabilities of your tires in case you need to do a sudden change of direction/speed.

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