Baloney... Keolu lies. All studies show that without rail the traffic will be much worse.  IIRC current ridership surveys show that rail will carry about 14% of the future H1 traffic. With rail, H1 traffic is expected to be about what it is now. But without rail traffic will be about 14% greater than what it is today - talking two hour drives into Honolulu. 

Expect even more traffic if Oahu growth is higher than expected. Expect less on H1 if we have urban sprawl but much worse traffic all over the island. Yes we'll start developing the North shore, windward, and east Honolulu. People need to live somewhere.