A new analysis from the state may help explain while traffic is so awful in Hawaii.

The number of commuters driving alone increased 74.2 percent from 1980 to the 2009-2013 period.

Put another way, that’s a jump of 253,680 commuters from 30 years ago to 441,988 in recent years.

DBEDT driving survey 2015

All told, when it comes to going to work, the share of those who drive alone has gone from 55.3 percent to 66.6 percent over the past 30-plus years.

“This is a remarkable increase compared to the 41 percent increase in total Hawaii population and 51 percent increase in population aged 16 and over during the 30 year period,” says the Research and Economic Division in DBEDT, which released the “Commuting Patterns in Hawaii” on Thursday.

Meanwhile, the share of workers who carpool has dropped by about 10 percent while the percentage of us who catch the bus, bike or walk hasn’t budged much over the past three decades.

DBEDT driving survey piechart 2015

One positive indicator: More of us are working from home, probably helped by the revolution in telecommunications.

The DEBDT report crunched other interesting commuting data, including by county, gender, earnings and Oahu neighborhoods.

For example, the more money you make, the more likely you drive your own car to work. But you probably already knew that.

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