San Diego Rush Hour Traffic (cities, driving, town)

[MantaRay]

I want to compare traffic in various cities in standardized (non-subjective) terms. I'm interested in how long does it take to get (strictly on the interstates) from 10 miles outside the downtown core to the downtown core in the morning rush hour traffic and from the downtown core to 10 miles outside the downtown core in the evening rush hour traffic. If I can find out what 10 mile times are, traffic comparisons become EASY and less subjective. I can easily know where 10 miles is by either my odometer or by exit numbers, which have become standardized to be mile-based. And in fact, it might be feasible for some people to do 15 mile rush hour times. Is anybody willing to participate in a little traffic experiement and observe San Diego's 10 mile or 15 mile (or 20 if it applies) rush hour driving times?