FWIW road traffic through the Kingsway tunnel has been QUIETER this week than normal. I usually transit westward around 8AM and return around 6PM most days and the queues have been noticeably shorter since Christmas.
I don't know if this is because the kids are still off school, or whether people are making alternative arrangements during the railworks. I suspect a lot of commuters are tending to take the long way round for now