Just Doin, The high density communities you are talking about should be confined to the Primary Urban Center, and not spread out all the way to Kapolei.  Since TOD will be built all along the rail line, including Kapolei, Waipahu, and Pearl City, it will add to the population in these areas.  Some of that additional population will take rail to work in town, but most will take their cars.  In other words, TOD will increase traffic along the H-1 corridor during rush hour.  If you think traffic is bad now . . .