Utah 14

It is a narrow, twisting 2 lane (good asphalt), that climbs up over 10,000'. You go about 19 miles up and another 19 miles back down. Can you do it? probably, will you and the Mrs have any fun, not likely. I've driven 14 but not the alternatives but from what I have read find an alternate route. Once you get onto 89 life is good. Beautiful road lots to see. :C

Crossing from I-5 to US 89 heading North

Not knowing where you are coming from and where you are going, but if traveling south from the north, I would suggest that 20 is a lot better and shorter.