It appears that non-freeway streets seem way off, with freeway travel closer to being accurate. For example, Beaverton, OR, into Portland. Where I live it's a

It appears that non-freeway streets seem way off, with freeway travel closer to being accurate. For example, Beaverton, OR, into Portland. Where I live it's at most, even at rush hour, 15 minutes to one of the two freeways near my house and this is estimating 30-35 minutes. The entire (house -> downtown) calculation is close (about 45 minutes downtown) but only for rush hour. Other than if there was an accident on I-5, there isn't a possibility of taking 50-55 minutes to get from my house to Tigard or Tualatin without spending 30 minutes lounging at Starbucks along the way. Looking at the data a little more, surface streets seem to simply be an estimate outward radially, with what appears to be very little taken into account otherwise. The freeways seem to be good, educated guess estimates.