Question:  So,there must be a traffic engineer out there who can answer THIS question. If 10 percent of people check their email on iphones or droids or blackberries while at stoplights, how much does that slow down traffic overall in a typical large city?
Answer:  In Traffic Operations class, we learned that reaction time (about 1/2 second to recognize that the light turned green and another 1/2 second to move a foot to the gas pedal and start pressing) accounts for about 1% of the typical tr...
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