From your 2 posts I am trying to understand when you were here/when you are coming. Are you talking Christmas time? If that is the case, yes it is the busiest time on the island so traffic can be crazy. I stay in Kapalua which is further than Napili and never have had it be awful unless there is an accident which will stop everything being limited lanes and roads. SW lives on island and does say when the tourists start watching the whales instead of the roads it does become an issue! I notice the most traffic during normal rush hour but I guess I have never found it awful outside of accidents. Maybe you can give more details as where you plan on going?
Sounds like you will be here on Wed, for two weeks. If so you will be ok the first week and then the second week will be really crowded. Seems to me about 15 dec and on until the first week of january, and then feb/mar are really busy with tourists.
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I haven't looked into it deeply (i.e. I can't provide any evidence other than analogies), but it seems like a lot of planes arrive in the early afternoon. Those people have to go somewhere - figure that half will go to Wailea/Kihei, and the other half are heading towards Kaanapali.
Given the number of times that I've been stuck in stop and go traffic between Ma'alaea and Ka'anapali, I always try to avoid this time period. Is that what you were looking for?
Commute hours are like they are everywhere. #6 hit it though - it does seem like there is a weird rush everyday early afternoon from tourists landing. Although west-side bound traffic seems worse - obviously it is longer and also a one lane road that way.
Road construction and reconstruction projects have been the recent delays in West Maui along the Hwy 30.
Listen to KPOA for traffic updates while you enjoy the Hawaiian music. They have the most up to date info because drivers on the road phone them.
There is only one way in and out of West Maui, a two-lane road between Maalaea and Lahaina. Then there are a LOT of people in those tall elevator buildings in Kaanapali. Once you get to Napili traffic eases as you go north to Kapalua.
Avoid commuter 'rush hours' as the worker bees swarm up to West Maui from Kihei and Kahului in the mornings, and back home in the late afternoons.
Is the new bypass helping with any of this in town?