From the Police site.
"Causeway Jump up
The very first jump-up for the 2023 carnival period will be taking place this evening, March 18, 2023 with the “cause way Jump-up”
Under the given permit, the jump-up will commence at approximately 8:00 p.m. and should end at 1:00 a.m. in the early morning
This event will commence in the vicinity of the Parking-lot in Simpson bay proceeding towards The Cause Way bridge, Union road, welfare road back to Simpson bay.
Those participating in this and other carnival events should be mindful that the Carnival period is a celebration for the community of St. Maarten, therefore police of St. Maarten request cooperation from all to make these events as trouble free as possible.
For visitors and individuals residing in the vicinity of Simpson bay and Cole-bay, please note that certain roads will be closed off for the duration of the parade and alterative traffic should be used.
Law enforcement officers are involved to ensure general safety throughout Carnival, not to hamper the Carnival festivities."

So far, it is a non-issue. Traffic is moving as of 10:30 in Simpson Bay.

We were at The Palms when the four trailers went by. Loud but fun, lots of people walking and dancing along with a lot of police mixed in the crowd of walkers that seemed very welcome and also enjoying the festivities.

We were finishing up, me having carrot cake, so we just hung out another 30 or so minutes before heading towards Cupecoy. It was slow in places but wasn't as bad as I thought it would be.
TB

My boat is anchored about 400 meters north of the causeway. It was LOUD! (by my own rules from 1978, I am therefore old)

I'm anchored in Simpson Bay and still heard the music despite earplugs! I just came back from the Dinghy Dock where one of the workers was saying it took her 2 1/2 hours to get across the Simpson Bay bridge sometime around 11pm!