Q. Can I include Sigalert.com traffic information on my Web site?
Q. How do I get the map to show the area where I drive?
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.
Q. What's the best way to bookmark the site so I see my personalized map when I return?
A. You have two options when bookmarking the map. Please choose the one that best meets your needs.
- Show the last map I saw:
Edit your bookmark to include only the map page (i.e., http://www.sigalert.com/map.asp)
- Always return to a specific map:
Position the map exactly how you like and then bookmark it.
Q. Where are the camera images for the stretch of freeway I drive?
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.
Q. I'm not receiving alerts on my cell phone. What could be wrong?
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.
Q. What is a Sigalert?
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."
Q. What is the origin of the term Sigalert?
Q. How do I cancel my subscription to My Sigalert?
Q. Where does the traffic information come from?
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.
Incident data comes from the
California Highway Patrol in a similar manner.
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
Q. Do you have historical information about accidents that happened before today?
A. No, we only have information about accidents currently affecting traffic. When an incident from their
logs, it is removed from our Web site as well.
Q. Who's behind Sigalert.com?
A. Sigalert.com was founded by Joel Johnstone and Jonathan Berke in 1998. On December 31, 2009, Sigalert.com was sold to Westwood One
and is now a wholly owned subsidiary.