Phil12/21((Apparently the objective is to get a bunch of idiots running out and timing light intervals and comparing the results to a chart which does not reflect accurate information. The chart says that a 30mph speed zone should have a minimum yellow light time of 3.5 seconds. Ironically ITE publishes a chart and according to their formula(used in the traffic engineers handbook in the section titled traffic control signals) the correct timing should be 3.2 seconds which is rounded up after the formula produces a 3.199 second result for that same 30mph zone. If we use the formula with a 35mph zone the results are 3.56 seconds and rounded up to 3.6 for the ITE chart while the source that the NMA is using references that a correct minimum yellow interval for a 35mph zone should be 4.0 seconds. The rest of the chart is as follows:

speed ITE results by formula by chart NMA suggested minimum
———————————————————————————————
40mph 3.93 sec 3.9 sec 4.5 sec
45mph 4.29 sec 4.3 sec 5.0 sec
50mph 4.66 sec 4.7 sec 5.5 sec
55mph 5.03 sec 5.0 sec 6.0 sec
60mph 5.39 sec 5.4 sec Not listed
65mph 5.76 sec 5.8 sec not listed

This comparison of what the ITE suggests and what the formula suggests to what the NMA suports shows you that the NMA is lying to you!

Also note that the NMA source suggests that a proper MINIMUM yellow change interval for 55mph is 6.0 seconds which exceeds the ITE formula and ITE chart by 1 second and also exceeds the proper yellow change interval as per the ITE formula and chart for a light placed in a speed zone 10mph higher than the one it is actually in. The ITE also tells us a couple of other important things like for yellow change intervals that calculate to values higher than 5.0 seconds the yellow change interval should be set at 5.0 seconds with the remainder of the time being added to the delay of the red to green interval for crossing traffic(otherwise known as the clearance interval or all red interval.) The ITE also tells us that yellow change intervals that are timed too long may encourage drivers to use the yellow change interval as an extension of the green interval(they will enter the intersection unlawfully). This is not a unique case with the NMA presenting less than accurate information as fact or presenting outright wrong information as fact. Why would the NMA be so dishonest in showing you the data, statistics or other factual information such as the proper timing chart for yellow change intervals? If they lie to you here about something that trivial just to make it appear as more traffic lights are improperly timd than actually are what else will they lie to you about? Promoting incorrectly long yellow change intervals is playing with your families safety and for what? To eliminate red light cameras and stop unlawful red light runners from being cited? Please check the so called facts contained here in any of these editorial articles before you give your support, donations or you use this bad information that you trust and get hurt or killed.))

There is an additional allowance (all red light) for clearance of the intersection if you are in that intersection or if you did not have time to stop.

This option is not taken into allowance by these cameras that take pictures at the end of the yellow light.

In addition the all red light interval is optional. This is optional because some intersections do not have pedestrians or high traffic. I believe that not using this allowed red light interval in intentional to get more tickets.

Will the NMA Foundation recheck the yellow light duration timing against ITE standards for minimum yellow duration. ITE standard provide longer yellow times than Federal (Missouri) MUTCD. ITE include length of intersection, different deceleration rate and prevailing speed (above) posted speed for yellow time calculation. General rule of thumb (actual) 40plus miles per hour 5second minumum- 6 seconds yellow time maximum with minumum 1/2 second opposing Red to Green delay. The Federal minumum yellow duration time is 3.0 seconds. Shorter than this is breaking the Federal Law of uniform traffic code devices. Hills, decline and weather effect deceleration rate. Posted 25 miles per hour s/b 4.00 seconds minumum yellow duration with conditions mentioned above.