A. If the area you are interested in is just off the map, try dragging the map with your mouse. If you are in a different city, choose your city from the Change Cities menu at the top of the page.

A. You have two options when bookmarking the map. Please choose the one that best meets your needs.

1. Show the last map I saw: Edit your bookmark to include only the map page (i.e., http://www.sigalert.com/map.asp)
2. Always return to a specific map: Position the map exactly how you like and then bookmark it.

A.

1. From the map page you can create a route by right clicking on a road and selecting "Start Route Here" for your desired start point.
2. The end point is created directly on the map as well simply by right clicking and selecting "End Route Here".
3. Once the route has been created select the Save Route button or view a list of 2 additional alternative routes if your desired route is not viewable.
4. In order to save a route or alert you'll first need an account with us which can be created by clicking the My Routes button on the map or by clicking here.
5. The Route widget will now appear allowing you to customize names, alert times and days by navigating through the Route Widget tabs or by clicking next.
6. When your alert is complete you will be prompted to save by clicking Save.
7. Your new saved route can now be viewed by clicking the drop down arrow next to the blue My Routes button on the map, the drop down list at the top right of the page or by going to the routes page.

A. We are currently dependent on the local Departments of Transportation (e.g., Caltrans) for camera images. The site currently shows all the cameras we have access to. As more cameras become available, we will add them to the site.

A. To receive alerts on your cell phone, your phone and service plan need to support text messaging. While nearly all cell phones sold in the last few years support text messaging, this is sometimes an additional option you need to sign up for from your wireless service provider (e.g., AT&T Wireless, Verizon Wireless, Sprint PCS). To find out if your phone supports text messaging, just ask your wireless service provider if your phone has an email address. If it does, then it will work with Sigalert.com. If it doesn't, ask them how you can get an email address for your phone.

A. The official definition of a Sigalert is "any unplanned event that causes the closing of one lane of traffic for 30 minutes or more."

A. Sigalerts are named after an early radio engineer in Los Angeles, Loyd Sigmon. You can read more about Loyd Sigmon and the history of Sigalerts on Wikipedia.

A. You can cancel automatic renewal on your account at any time using the Billing tab of the My Account page.

You can also delete your account from the Account tab on the My Account page.

A. The traffic information comes from many different sources. In California, freeway speeds are primarily collected by Caltrans from sensors embedded in the roads. We download the raw speed data from them and display it on our site in a (hopefully) easy to use format.

Los Angeles speed data comes courtesy of the Regional Integration of Intelligent Transportation Systems (RIITS) which is sponsored the Los Angeles County Metropolitan Transportation Authority (Metro).

Many of the San Francisco Bay Area sensors come from our partner SpeedInfo.

For the outlying areas of California and rest of the country, the speed information comes from AirSage

Incident information comes from our parent company, Clear Channel, and the California Highway Patrol.

A. No, we only have information about accidents currently affecting traffic. When an incident is removed from their logs, it is removed from our Web site as well.

A. Sigalert.com was founded by Joel Johnstone and Jonathan Berke in 1998. In 2011, Sigalert.com was sold to Clear Channel Media and Entertainment.