For many California and Arizona natives, the term "Sig Alert" provides not-so-good associations. And for good reason: a Sig Alert is "any unplanned event that causes the closing of one lane of traffic for 30 minutes or more." So, when the traffic reporter says that "there's a Sig Alert at fill in your favorite freeway" on the radio, you're most likely in for a waiting game.
When visiting sigalert.com using your iPhone or iPod touch, you are automatically redirected to the service's iPhone formatted site. The site's map view shows a color coded schema -- with green, orange and red hues to indicate traffic conditions -- similar to that on many dedicated map apps.
But the site offers a compelling feature that many of its app store brethren either lack or provide inconsistent results for: location-aware freeway speed and traffic advisory information. In other words, sigalert.com can tell you the speed that cars that pass certain exits are traveling at, as well as what is causing slowdowns in a given area -- such as construction work, narrowing lanes, and traffic accidents.
So while sigalert.com isn't a full-fledged app, its functionality rivals and bests offerings by many of its counterparts in the app store.
Need to find out if there's an accident on the freeway? There's a map for that.