I'm not sure if the car is public enough but with my 4th child I lived a
45min car drive away on mostly straight interstate.  The M. battery pump was
great.  I drove a stick shift but on the interstate I could drive and pump
without any problem.  I only worked 1-2 days/wk so sometimes I was barely
ahead of the baby with the supply of bottled good stuff.  She never had one
drop of the "other concoction"!!