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Old 06-06-2011, 10:29 AM
 
2 posts, read 12,692 times
Reputation: 11

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How accurate are the travel times given by sigalert.com?

Any forum members find sigalert to be consistently off in its predictions?

I believe they are using real-time data which would make them much better than any of the alternatives.

Do they factor in the time it takes waiting on the exit lane/ramp trying to get to the surface streets?

If I exit the 101 at Cahuenga how much time should I expect to add to the sigalert time to reach Sunset?
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Old 06-06-2011, 10:58 AM
 
Location: South Bay
7,226 posts, read 22,189,154 times
Reputation: 3626
there is definitely a delay on sigalert, though i'm not sure what the exact delay is. sigalert also only covers freeways, which is why i go with google maps. i find google and sigalert accuracy to be about the same on freeways and google tracks traffic on major thoroughfares. google maps is also easier to use on my cell phone, so it wins hands down.
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Old 06-06-2011, 11:11 AM
 
Location: Columbia, California
6,664 posts, read 30,605,568 times
Reputation: 5184
I have sat in one place on the freeway for a hour without any mention on the radio, and drove past where they were reporting a major scene that was clear. Seems like most reports are a hour or two late.
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Old 06-06-2011, 01:52 PM
 
362 posts, read 817,531 times
Reputation: 160
Quote:
Originally Posted by ferretkona View Post
I have sat in one place on the freeway for a hour without any mention on the radio, and drove past where they were reporting a major scene that was clear. Seems like most reports are a hour or two late.
This.

The traffic is too dynamic for any of those services to keep up... yet.
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Old 06-06-2011, 01:55 PM
 
32,516 posts, read 37,157,543 times
Reputation: 32579
KNX 1070. Real time traffic from real time drivers.
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Old 06-06-2011, 02:07 PM
 
Location: Las Flores, Orange County, CA
26,329 posts, read 93,734,875 times
Reputation: 17831
Sigalert is best for freeways for two reasons: 1) You can get the actual speed real time as measured by the sensors and 2) There are two lists of speeds, one for the regular lanes and one for the carpool lanes. If you're in a vanpool like I am, I check the carpool lane speeds. Sometimes the color code on the map shows the freeway moving slow but if you click on the sensors it may show the carpool lanes moving fast. For example, the 405 through Long beach could be color coded red (very slow) but if you click on the sensors it may show the carpool lane at 58 with the regular lanes at 22 (that's why the map is red). Sigalert also has lots of traffic cameras on the map so you can do a visual check on a suspect intersection.

Sigalert.com Orange County Traffic Conditions, 405 South


Google Maps Traffic is best for everything other than freeways because it provides street traffic using crowdsourcing. Google Maps integrates the GPS information for phones with "Show My Location" (or something like that) enabled so it can provide an estimate of speed. One big error source are pedestrians walking with their cell phones next to the road - google has to have a way to filter those out - maybe they can.
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Old 06-07-2011, 06:00 PM
 
12,823 posts, read 24,390,321 times
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I was trying to find a link to an audio file with an old (circa early 80s) sigalert "beep beep ... beep beep" clip - LOL! Have not found it yet. No doubt Charles will unearth it!
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Old 06-07-2011, 06:01 PM
 
12,823 posts, read 24,390,321 times
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Actually it was more of a "doot doot ... doot doot" than a "beep beep" - LOL!
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Old 06-07-2011, 06:35 PM
 
Location: Las Flores, Orange County, CA
26,329 posts, read 93,734,875 times
Reputation: 17831
Knx Traffic Sounder | Honk if you've heard this one - Los Angeles Times

It's right about the 30 second point here:

YouTube - ‪Chuck Rowe on KNX‬‏

Last edited by Charles; 06-07-2011 at 06:49 PM..
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Old 06-07-2011, 08:20 PM
 
12,823 posts, read 24,390,321 times
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Quote:
Originally Posted by Charles View Post
Nailed it!
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