What US routes need to be updated the most?

[Thomas77]

I would like to know.

[hotdogPi]

US 287 northwest of Fort Worth to at least Amarillo.

[webny99]

It really depends what is meant by "updated".

[ilpt4u]

I would like to know.

US 93 from the Hoover Dam to Wickenburg
US 60 from Wickenburg to Phoenix (yes, I realize the I-11 route will diverge from existing US 60, almost certainly, and hit I-10 west of Phoenix)

US 30 Joliet, IL to Fort Wayne, IN

[Max Rockatansky]

US 20-26 in the Boise area.  A lot of it is still only two lanes. 

[Ned Weasel]

The ones with signage gaps could really benefit from signage updates.  So, I'd like to nominate US 6 in Colorado for starters.

[NWI_Irish96]

For Indiana:

US 30 from IN 49 to I-65
US 31 from US 24 to IN 38
US 231 from IN 56 to I-64

[US20IL64]

US-41, north part of Lake Shore Dr. in Chicago. New bridges, for sure.
And re-route 41 off of Foster Av, a 2 lane residential street. To Hollywood Av, Ridge, Peterson to Lincoln Av.

[OCGuy81]

I'd say US-101 in Oregon.  It's not terrible, but given that it's the only real highway on 300 plus miles of the Oregon coast, there are a lot of areas where some curves could be smoothed out, maybe some extra passing lanes.