http://www.frontstretch.com/mneff/12745/
I'm not going to copy the entire article, but I found this paragraph particularly informative.
I put in the bold print.
I'm not going to copy the entire article, but I found this paragraph particularly informative.
As a race progresses, the time that commercials air is determined on the fly based on the activity on the track. There are people in the production truck, utilizing different technologies to try and anticipate the caution flags, the fuel windows, and the duration of the caution flags to try and decide when blocks of commercials are aired. When a caution flag is in effect, ESPN attempts to show the pitstops during that caution, and then air commercials before the race goes back to green. With the help of NASCAR race control the production team tries their best to determine how long a given caution period is going to take and time out the commercials to return to action before the green flag flies. The odds of them catching the green on the super speedways is far greater than on short tracks simply because they can let the commercial run to completion before coming back for the green when they are informed of one lap to go. At a track like Martinsville, if they are informed of one lap to go, there is only a window of 25-30 seconds before the race is going to go back to green. If ESPN breaks out of a commercial before it is completed, they have to rerun the entire commercial at a later point in the race, in addition to the commercials planned for that later point. As soon as they miss a commercial, it throws off the rest of the allocation of commercials, and the air time for racing has to be reduced to make up for it.
I put in the bold print.