A. The speeds that you see on our site come from sensors Caltrans has buried in the freeway. For freeways in less populated areas, these sensors often don't exist. For freeways in heavily traveled areas, the sensors are usually there but, for any number of reasons, Caltrans may not have speed information from them. Rest assured that as soon as Caltrans provides additional speed information to us, we will pass it along to you via our Web site.

A. Caltrans has divided the state into 12 "districts" and each Caltrans district office controls what information is available for their particular part of the state. As you can see from our site, the Caltrans office in San Bernardino has A LOT of camera images available. San Diego currently has only 4 cameras, but they are very well positioned around the busy 5/805 merge. We are working with the other Caltrans district offices to bring more cameras online. As soon as Caltrans makes the cameras available to us, we will make them available to you.

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 problem is due to ad blocking software (e.g., Norton Internet Security) that you are running on your computer. If you disable this software for our site, the map background (with freeways, land, water, etc) image will appear for you.

To disable ad blocking in Norton Internet Security (NIS) 2004:

1. Go to Sigalert.com in Internet Explorer. (Even if you use Netscape, Mozilla, or Firefox, follow these instructions using Internet Explorer.)
2. Make sure the NIS toolbar is displayed (it has a green and blue world icon on it). If it is not shown, choose View | Toolbars | Web assistant from Internet Explorer's menu.
3. Click on the triangle next to the NIS world icon and uncheck "Block ads on this site" from the menu that appears.

To disable ad blocking in Norton Internet Security (NIS) 2003:

1. Open NIS (double-click on the NIS world icon near the time displayed in your Windows task bar).
2. Select "Status and Settings" under "Norton Internet Security" if it isn't already selected.
3. Select the Ad Blocking option and press the Turn Off button. Note: You cannot disable pop-ups for a single site in NIS 2003. Therefore you must disable ad blocking completely.

A. The problem is due to ad blocking software (e.g., Norton Internet Security) that you are running on your computer. To get the pop-ups to appear, you'll need to first disable ad blocking and then clear your browser's cache to undo the damage done by the ad blocker.

To disable ad blocking in Norton Internet Security (NIS) 2004:

1. Go to Sigalert.com in Internet Explorer. (Even if you use Netscape, Mozilla, or Firefox, follow these instructions using Internet Explorer.)
2. Make sure the NIS toolbar is displayed (it has a green and blue world icon on it). If it is not shown, choose View | Toolbars | Web assistant from Internet Explorer's menu.
3. Click on the triangle next to the NIS world icon and uncheck "Block ads on this site" from the menu that appears.

To disable ad blocking in Norton Internet Security (NIS) 2003:

1. Open NIS (double-click on the NIS world icon near the time displayed in your Windows task bar).
2. Select "Status and Settings" under "Norton Internet Security" if it isn't already selected.
3. Select the Ad Blocking option and press the Turn Off button. Note: You cannot disable pop-ups for a single site in NIS 2003. Therefore you must disable ad blocking completely.

Now you need to get the file that the ad blocker broke out of your Web browser's cache.

To clear Internet Explorer's cache:

1. Select Tools | Internet Options from Internet Explorer's menu.
2. Press the Delete Files button.
3. Press OK on the Delete Files screen.
4. Reload the map page.

To clear Netscape's, Mozilla's, or Firefox's cache:

1. Load the map page.
2. Hold down the Shift key on your keyboard and press the Reload button in the browser's toolbar.

A. The green bar automatically defaults to your "active" route. A route is considered active if there are any "active" alerts on it (i.e., based on the current day/time, the alert is set to notify you of problems on the route).

So, to get the route you want to appear in the green bar, create an alert on that route and make sure the alert's days/times cover when you typically check the site. You can create an alert from the My Sigalert | Alerts page.

If you don't want to receive email or text alerts for this route, just check the "Temporarily disable this alert" box when creating the alert.

A. The official Highway Patrol 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 traffic reporter in Los Angeles, Loyd Sigmon. You can read more about Loyd Sigmon and the history of Sigalerts on Wikipedia.

A. To cancel your automatically renewing subscription, please email support@sigalert.com.

Be sure to include your login name and email address so that we can find your account information in our database.

If you cancel your subscription, your account will remain active until your renewal date but you will not be billed again. After your renewal date has passed, your account will remain in our system but the My Sigalert features will be disabled.

You can manually renew your account at any time by entering your credit card information on our secure payment page.

If you have purchased a My Sigalert subscription and want your account deleted, you will not receive a refund for the remaining balance on your account.

A. 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.

A. We occasionally run into problems gathering traffic information from Caltrans and the CHP. These are usually temporary and correct themselves as soon as the Caltrans/CHP data comes back online.

A. We only have information about accidents currently affecting traffic. When the CHP clears an incident from their logs, it is removed from our Web site as well.

A. Absolutely! Just send an email to Partners@Sigalert.com and we'll send you a special URL you can use inside a frame.