Raw Data: The Timing of the Traffic Lights for the Upper Market Castro Area.

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Traffic in our area is governed by a network of computerized very high tech traffic signals installed at every major intersection. Many if not all of these are coordinated to guide traffic as smoothly as possible through this neighborhood while enforcing sufficient periods for pedestrians to cross the streets. And the timing of these lights is not posted on the lights themselves or anywhere else that I can find.

The timing of the traffic signals changes throughout the day at many intersections. The weekend versus weekday dynamic is covered as well. So our earnest group of neighborhood amateur traffic engineers went forth recently and surveyed many local corners with stopwatches to reverse engineer the prioritization of each individual intersection. This explains the different timing settings for the same intersections on different days or times of the day. (We also rounded our figures to the nearest second while these signals are possibly programmed to the tenth or hundredth of a second.)

A few more words on traffic signals. The base goal is to clear the whole queue of waiting cars in one cycle without wasting any extra time. Correctly balanced the lights provide for the optimal and continuous flow of traffic through any given intersection. The signalized intersections are expensive, starting at $250,000 per corner and going way up from there as you add sensors and other devices to the system.


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This is from the Federal Highway Administration Research & Technology Signalized Intersections Informational Guide, August 2004.

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Federal Highway Administration Research & Technology Signalized Intersections Informational Guide, August 2004.

Traffic Signal Timing in the Castro Upper Market Area

Duboce & Mkt                  N – 33                  E/W – 51          S-59       1/10/17           6-7PM

Duboce & Mkt                  N – 33                  E/W – 50          S-59       1/11/17           8-9AM

Duboce & Mkt                  N – 33                  E/W – 50          S-59       1/15/17        11AM-12

 

Dolores & Mkt                  N/S – 31               E/W – 52                         1/9/17             1-2PM

Dolores & Mkt                  N/S – 30               E/W – 52                         1/10/17           6-7PM

Dolores & Mkt                  N/S – 30               E/W – 52                         1/11/17           8-9AM


Guerrero & Duboce        N-37                     E/W – 36          S-50       1-17-17           8-9AM

Guerrero & Duboce        N-35                     E/W – 38          S-49       1-17-17           5-6PM

Note: Guerrero has a South bound left turn lane onto Duboce set for approx. 12 seconds. Northbound traffic holds while this lane clears.

Guerrero & 14th                N/S – 32              E/W – 25                         1/17/17           8-9AM

Guerrero & 14th                N/S – 32              E/W – 25                         1/17/17           5-6PM

 

Guerrero & 15th                N/S – 31              E/W – Blinking Yellow  1/17/17           8-9AM

Guerrero & 15th                N/S – 31              E/W – Blinking Yellow  1/17/17           5-6PM

 

Guerrero & 16th                N/S – 30              E/W – 23                         1/17//17         8-9AM

Guerrero & 16th                N/S – 27              E/W – 25                         1/17//17         5-6PM

 

Guerrero & 17th                N/S – 31              E/W – 25                         1/17/17           8-9AM

Guerrero & 17th                N/S – 31              E/W – 25                         1/17/17           5-6PM


Valencia & Duboce          N/S – 36              E/W – 49                         1/17/17           6-7PM

Valencia & Duboce          N/S – 36              E/W – 49          S-36       1/18/17           9-10AM

Note: Valencia has a South bound left turn lane onto Duboce. Use & timing of this option varies.

 

Valencia & 14th                 N – 29                  E – 21             S – 37    1/17/17       6-7PM

Valencia & 14th                 N – 29                  E – 21            S –          1/18/17       8-9AM

 

Valencia & 15th                 N/S – 32              E/W – 21                         1/17/17           6-7PM

Valencia & 15th                 N/S – 32              W – 21                             1/18/17           8-9AM

 

Valencia & 16th                 N/S – 28              E/W – 29                         1/17/17           6-7PM

Valencia & 16th                 N/S – 28              E/W – 28                         1/18/17           8-9AM

 

Valencia & 17th                 N/S – 32              E/W – 25                         1/17/17           6-7PM

Valencia & 17th                 N/S – 32              E/W – 25                         1/18/17           8-9AM

 


Dolores & 14th                  N/S – 28               E/W – 28                         1/9/17             1-2PM

Dolores & 14th                  N/S – 28               E/W – 29                         1/10/17           6-7PM

Dolores & 14th                  N/S – 28               E/W – 29                         1/11/17           9-10AM

 

Dolores & 16th                  N/S – 26               E/W – 29                         1/9/17             1-2PM

Dolores & 16th                  N/S – 26               E/W – 29                         1/11/17           9-10AM

Dolores & 16th                  N/S – 24               E/W – 33                         1/11/17           5-6PM

Dolores & 16th                  N/S – 26               E/W – 30                         1/15/17        11AM-12

 

Dolores & 17th                  N/S – 28               E/W – 29                         1/9/17             1-2PM

Dolores & 17th                  N/S – 29               E/W – 27                         1/11/17           8-9AM

Dolores & 17th                  N/S – 26               E/W – 30                         1/11/17           5-6PM


Church & Mkt (14th)        N/S – 31               E/W – 37          X-24       1/9/17             5-6PM

Church & Mkt (14th)        N/S – 31               E/W – 37          X-24       1/10/17           5-6PM

 

Church & 15th                   N/S – 31               E/W – 26                         1/9/17             8-9AM

Church & 15th                   N/S – 31               E/W – 26                         1/10/17           5-6PM

 

Church & 16th                   N/S – 22               E/W – 34                         1/9/17             8-9AM

Church & 16th                   N/S – 29               E/W – 27                         1/9/17             6-7PM

Church & 16th                   N/S – 22               E/W – 34                         1/10/17           7-8AM

Church & 16th                   N/S – 29               E/W – 27                         1/11/17           5-6PM

Church & 16th                   N/S – 30               E/W – 27                         1/15/17        11AM-12

 

Church & 17th                   N/S – 34               E/W – 24                         1/9/17             8-9AM

Church & 17th                   N/S – 34               E/W – 24                         1/10/17        10-11AM

Church & 17th                   N/S – 34               E/W – 24                         1/10/17           5-6PM


Sanchez & Mkt                 N/S – 26                E/W – 42                          1/9/17             8-9AM

Sanchez & Mkt (15th)      N/S – 26               E/W – 44          X-23       1/9/17             5-6PM

Sanchez & Mkt (15th)      N/S – 26               E/W – 47          X-23       1/10/17           7-8AM

 

Sanchez & 16th                 N/S – 20               E/W – 36                         1/9/17             8-9AM

Sanchez & 16th                 N/S – 20               E/W – 36                         1/10/17           8-9AM

Sanchez & 16th                 N/S – 21               E/W – 36                         1/11/17           5-6PM


Noe & Mkt                         N/S – 25               E/W – 45                         1/9/17             8-9AM

Noe & Mkt (16th)              N/S – 25               E/W – 43          X-23       1/9/17             6-7PM

Noe & Mkt (16th)              N/S – 25               E/W – 46          X-20       1/10/17           8-9AM

Noe & Mkt (16th)              N/S – 25               E/W – 43          X-23       1/11/17           5-6PM

Special note about streetcar turning movement at Noe & Market. This removes 20 seconds from the overall cycle which is divided evenly between the N/S and the E/W time allotments.


January Calendar to make day of the week correlation easier.januarycalander

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