3PM on a Friday isn't to bad on the south end of the strip (Airport to Flamingo). I actually use this section of the strip as an alternative to I-15 on Friday afternoons, the I-15, I215 merge bring I-15 north to a crawl with the added incoming California traffic. Here's a site with some live cameras around town
http://www.live-web-cams-las-vegas.com/ 