Actually, in my opinion, Arkansas likes the higher speed limits...
Look at Walton Blvd in Bentonville... The speed limit is 50 MPH on US 71 Business (Walton Blvd with a 5 lane section [continuous center turn lane aka the devil] with development on all sides). It's all development, with a 5 lane/center turn lane... And all 50 MPH... It scares me at time.
US 62 East (Hudson Road) in Rogers is 45 MPH... It's a 5 laner with a center turn lane. I fight for my life trying to turn off of it... if that semi or car or truck ventures to the left or right a few inches in their lane, I'm a gonner!
Arkansas (city or state) needs to reevaluate their speed limits in urban areas, because it borderlines on ridiculous. And start f(&%&) implanting medians! Medians are your friend! Good grief!