The average number of auto trips per house is 10 according to traffic engineers. It’s more for people closer to shopping areas. That includes, deliveries, trash, mail…

So, the new Rohnert Park subdivisions will generate 51600 new trips. Can Petaluma Hill Road handle that? Well, today I waited 10 minutes to drop my kid at Penngrove School.

http://www.ci.apple-valley.mn.us/DocumentCenter/Home/View/717

https://www.rita.dot.gov/bts/sites/rita.dot.gov.bts/files/subject_areas/national_household_travel_survey/daily_travel.html