Variable speed limits & Garmin's

Usually, they are located and active in construction zones. There is no way to keep track of the speed limit in these areas on a GPS. It all depends on if workers are present. Some of these things will drop the speed limit by 10 mph from 0700 to 1700. They will then reset to the lawful speed limit. There are days when the variable speed limit may not change at all. So, there is no way to input that to a GPS and have it be correct. The best thing to do is to be vigilant and watch out for those changes.

Something that I haven't seen in 30 or 50 years are speed limit signs with black-on-white numbers for the daylight speed limit and white-on-black for nighttime.

Yes, I agree vigilance is indeed the key.

I was wondering if anyone had heard anything from Garmin or seen anything about the various navigation tools about if they were thinking about how / if they were considering addressing these new variable issues..

Ohio, many years ago, had a speed limit of 60 in the daytime and 50 at night. They used a light shifting type of paint on the signs. I don’t know how it worked but it would show 60 in daylight but when your headlights hit the sign at night, it would show 50. I always thought it was kind of neat when, every once in a while, and if your headlights hit it at a certain angle, you would see 50 and then for a brief second, you would see 60. If any of you know how this worked, I would be interested in knowing.

Check the thread at https://www.aaroads.com/forum/index.php?topic=3038.0, especially reply #5 and #13.

I don't think that the speed limit noted on your Garmin will do much to prevent a speeding ticket. What's posted is what you need to honor.
Expecting Garmin to make live adjustments on the speed limit is unrealistic.

I think a tool which will get the right answer for these cases needs to supplement stored map information with actual sign reading.

My Tesla reads some speed limit signs (but does not read much if anything else, such as "no right turn on red"). The current software is not as good as it should be at blending what it reads with what comes from the database--but we hope it will get better.

I don't think there is much hope in this matter for devices which lack a sign-reading camera.

I am now enlightened as to how those signs worked. Very interesting! I was always curious as to how those signs could do that. Thanks again for the info.

This is a great time to use Cruise Control. Not perfect, but it helps.

Cruise Control = "Cop Control"

But if the variable speed limit signs change, the "Cop Control" device is useless unless I the operator notice & adjust the device

Having just driven from Kansas to Nevada and back this week, I can attest that the Garmin (DS55) Doesn't adjust to those variable speeds, as the Posted Speed Limits are hard wired in the current map's software and can'r be changed by the Drive APP.