Battle Ground’s Jen Kootstra, now retired, doesn’t make the commute south on the interstate highways in the county as much as she did when she was still working as an engineer for HP.
Now, she makes trips south roughly weekly, heading to the 78th Street Heritage Farm, where she’s involved in the Master Gardener program, but she still wonders: How do traffic officials figure out travel time estimates on highway reader boards, such as the one north of Salmon Creek?
Kootstra submitted her question through The Columbian’s Clark Asks website feature, where readers can suggest and vote on questions for further reporting.
Kootstra and her husband, also a former HP engineer, hypothesized that the system used some kind of method that picked up, then extrapolated travel time from, motorists’ cellphone signals.
Her husband has a good track record for such things, she said, “So I’m testing his answer.”