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I'm interested in what route to take between Denver, Colorado and Salt Lake City, Utah, and vice-versa.

http://maps.google.com/maps?q=Denver,+CO++to++Salt+Lake+City,+UT

It would seem like there is one northern option and two southern options.

  • In the north, I-25 in Colorado to Wyoming, and then I-80 throughout Wyoming and into Utah.

  • In the south, I-70 in Colorado, then

    • either SH 13 and SH 64 in Colorado, and US-40 in Utah,
    • or, more I-70 / US-50, through Grand Junction, CO, and US-6 in Utah.

What's the difference between these ways, and which one is better, or best avoided? I'm driving in the summer (June 2013); interested in a short route; a little scenery wouldn't hurt; too much engine and tyre wear, bad roads and bad fuel economy is best avoided (driving own car), but high highway speeds are welcome; planning to drive in one or two days, possibly stopping along the highway to get some sleep (spots with night temperatures of around 20°C are welcome, and so are spots where you can get some shade during the daytime). Also, last, but not least, it wouldn't hurt if the route has some T-Mobile USA UMTS, EDGE or GPRS coverage (without classified as roaming).

As far as Google Maps go, it seems like all three routes are roughly the same, in both the time and the distance, so, looking for some more feedback. For DEN⇆SLC, I've so far taken I-80 once when eastbound and I-70 w/ US-6 once when westbound (I've only had one SLC⇆DEN trip).

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Let's start from the obvious. Time en route is different, mileage, speed. Is that what you were looking for? If not please provide criteria for better and timeframe you will be taking it. –  Karlson Jun 18 '13 at 2:09
    
T-Mobile USA has coverage for most of the I-70 route through Grand Junction, CO, but not for the other two routes -- a point to consider. –  cnst Jun 18 '13 at 19:49
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why don't you improve your question? Remove all "best" and "better". Add the first obvious differences you target, length, duration, ... Add you wonder about lookouts or scenic routes, pavement quality, ... Or whatever someone else can think about. In any case, remember YOU are supposed to make the choice, not the others, so ask for the differences, not for the better route! –  Vince Jun 18 '13 at 20:23
    
@cnst There are great many travelers that take road from Denver to Salt Lake City that have a lot of experiences, truckers look for the longest but fastest route, nature lovers for the most scenic, people that just want to get to SLC looking for the fastest for the time, people that want extreme driving conditions will only be driving it in the winter... Collectively we have absolutely no idea what you're looking for, we're no psychics, so there is no reason to be annoyed just clarify what you're looking for. –  Karlson Jun 18 '13 at 22:43
    
Beware that the southern routes climb to 10,000'. This could be an issue for people who are sensitive to altitude. –  Loren Pechtel Jun 19 '13 at 20:44
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1 Answer 1

Based on your criteria, the I-70 to US-6 route appears to be superior.

  • This route has T-Mobile 3G coverage along most of its route, whereas I-80 has little or no data coverage west of Cheyenne.
  • This route is slightly shorter, though the difference in distance is trivial. As both routes travel through mountain passes, fuel usage should be similar between them.
  • Aside from far eastern Utah and far western Colorado, this route has many possibilities for scenic overlooks, stopping points, etc. The Wyoming route has a similar stretch of nothing, so it's even either way; neither route has a good "halfway" point that's approximately half way. Thus I'd recommend starting in the morning and making a one-day drive of it, by either route.
  • If you start your westbound trip in the morning, the afternoon sun won't be in your eyes as you travel north on US 6 into Salt Lake. Nor, when you leave Salt Lake in the morning, will the morning sun be in your eyes as you travel south on US 6.
  • US 6 is divided highway (dual carriageway) much of the way (about 2/3 of the distance) from I-70 to Salt Lake City. The state highways won't be.
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