First I noticed that the speed limit is 80 on most of I-15. I saw other signs like slower traffic use flashers when going up hills that had 3 lanes. So what does slower traffic mean? Slower than what? They also restrict the left lane to no vehicles over x number of lbs or x number of axles

The traffic must have been pretty light while you were on I15Those signs all seem to apply to grades. If you're going 20-30 under the speed limit up a steep grade, or down one, the left lane is off limits.

I think it means slower than the current traffic speed. Which means trucks, motor homes, and old geezers like me.Just came back from SLC on I-15 and I-84....both have 80 mph limits of which I tried (in my toad...not mh) to stay right at 80. At least 75% of the traffic was going faster than me, the other 25% were trucks that are limited to 70 mph.No matter what the speed limit is, most will always driver faster....make it 120mph and you'll find most will be doing 130.Ron

Utah roads are very well maintained, drivers are courteous...its those CA drives that bug me.

Most interstates have a maximum and a minimum speed limit. Very few interstates post the minimum, usually 40 mph (at least the one's I've seen). The Appalachian Mountain area does sometimes post a minimum. Then on the steeper grades, there are also signs posted, slower traffic keep right. Sometimes, use flashers. I think it simply means, if you are chugging near the minimum or under it uphill especially, then keep it right and use your flashers. Common sense says keep it right anyway! If you come up behind someone running slower, pass then, then move back right again. If there is a chain of them in the right, keep passing.It's intended to keep the big rigs from blocking all lanes of traffic going up those steep hills, chugging at 25 miles an hour, blocking traffic for 3 miles behind!

Do you really need a sign to tell you when to turn on your flashers for safety :@

Road signs in UT | Good Sam Community

Lwiddis
Explorer II
Jul 27, 2017
Utah roads are very well maintained, drivers are courteous...its those CA drives that bug me.
lanerd
Explorer II
Jul 27, 2017
I think it means slower than the current traffic speed. Which means trucks, motor homes, and old geezers like me.

Just came back from SLC on I-15 and I-84....both have 80 mph limits of which I tried (in my toad...not mh) to stay right at 80. At least 75% of the traffic was going faster than me, the other 25% were trucks that are limited to 70 mph.

No matter what the speed limit is, most will always driver faster....make it 120mph and you'll find most will be doing 130.

Ron
GordonThree
Explorer
Jul 27, 2017
The traffic must have been pretty light while you were on I15

Those signs all seem to apply to grades. If you're going 20-30 under the speed limit up a steep grade, or down one, the left lane is off limits.

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