They are hit and miss. I drove to work from west Temple to downtown, and my coworker came from east of town, and we both made it. There are spots where you need to be careful, and some vehicles can't seem to make it up some certain hills (like in front of the football stadium up towards Chic Fil A), but it is fine. People are way too scared of stuff like this. Just be smart, don't suck at driving, and come on in.