Electronic circuits in computers can switch flows on and off millions of times per second, but it takes nearly 10 seconds to stop and start each flow of motor vehicle traffic.
(Electronic circuits in computers; can switch; flows; T:on and off millions of times per second) (nearly 10 seconds; to start; each flow of motor vehicle traffic)
Electronic circuits in computers nearly 10 seconds
can switch to start
flows T:on and off millions of times per second
each flow of motor vehicle traffic