The winner of the most courteous driver category was Portland, Oregon, for the second straight year. It remained in the top spot because its drivers were:
- Least likely to honk the horn at another driver
- Least likely to have been speeding
- Least likely to have seen other drivers cutting between lanes without warning
Baltimore's drivers went into a tailspin compared with last year's survey. After finishing third on the "most courteous" list in 2013, the city finished third on the "least courteous" side of the ranking this year.
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The swing can be attributed to the city's drivers being the most likely to use an obscene gesture while driving.
For the full rankings, see the AutoVantage survey.
—By CNBC contributor Michael Strong.