Driving home at rush hour can be rough, but your situation may not be all that bad compared to commuters in cities like Los Angeles, San Francisco, and Honolulu. TomTom measured the percent increase in travel time that each citys drivers see during peak hours, finding that LA and SF topped the list with time increases of 36 percent and 32 percent, respectively. While that certainly signals a need for improved infrastructure in these cities, TomTom is using these frustrating figures to remind people what a good navigation system can do to help too.