So having looked through this I have a few comments:

1. It is unclear whether they studied traffic before or after the Jersey Ave extension opened as the study is '2021' and the extension opened mid year.
2. They want to add some stop signs/better striping in places that should be non-controversial but also not do much.
3. The big proposal (recommended vs other options) is to make the following changes

• Erie St One-Way southbound between 10th St & 9th St
• Road Closure for left turn movements from 9th St onto Marin Blvd

The outcome being:

To be conservative in the analysis, the northbound volumes on the intersection of 9th St & Erie St were not reduced but redirected to adjacent streets based on existing traffic conditions. Approximately 10% was rerouted to Monmouth St, 25% stays on Erie St and loops around the Van Vorst Park, and 65% was rerouted to Marin Blvd. A graphical representation of the vehicle distribution can be found within the volume figure for Alternative 1 in the appendices.

Based on our analysis of Alternative 1, we observe that the local roadways surrounding the Van Vorst Park neighborhood operate at acceptable levels of service of ‘D’ or better. The demand along the I-78/Rt139 highways exceed demand; therefore, excessive delay and queuing is expected. The intersection of 12th St/I-78/Rt139 EB & Jersey Ave with a LOS ‘F’ has heavy traffic coming from all directions with vehicles trying to access the southwest area of Hoboken, the downtown area of Jersey City, and entrance to the Holland Tunnel.

The LOS along Monmouth St and Marin Blvd will slightly increase due to Northbound vehicles being rerouted to these streets while the LOS along Erie St will slightly decrease. There is an overall degradation of 4.92% in the morning peak hour and 1.87% in the evening peak hour in network performance since heavier traffic volumes are anticipated on already busy streets.

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Other options were to basically restrict left turns off Columbus in various ways.

I don't love any of the options, but I didn't expect I would, there's only so much to be done here and if you live in the HP area almost all of them make it much harder to get in/out.

The problem with the Erie plan is that it will shift a bunch of traffic to Monmouth, which is already clogged when things get bad. This makes me think that the study may not have taken place after the Jersey Ave extension opened, though I don't know if that would have changed much.