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alex-mucci / TNC-Demand-Model

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Downtown Zone Not Matching with Census Tracts #9

Open alex-mucci opened 3 years ago

alex-mucci commented 3 years ago

The downtown zone refers to the area where ride-hailing trips are subject to the higher Chicago congestion-based tax. The downtown zone can be officially found here. I drew the downtown zone in ArcGIS using the streets in the base map and my own judgement. The shape clearly does not match with census tract boundaries. This is not because of my judgement, because some of the streets used as a boundary are not census tract boundaries. I manually clicked on every census tract that I felt like should be included in the downtown zone and recorded it in a csv file.

The blue lines in the image below shows the boundaries of all the census tracts I considered to be in the downtown zone (dark black line). As you can see, their boundaries extend further than the downtown zone. The west boundaries are not an issue because they are mostly Lake Michigan. There are a few that will include trips that are not technically inside the downtown zone. The data is not available as point data, so I think this is the best I can do. image

My general rule was to include as much of the downtown zone as possible. Even if the boundaries of the census tract went outside the zone and risked adding trips that are not within the zone. I did exclude one census tract that I felt had too much of its area outside of the downtown zone to be included (see below). image

alex-mucci commented 3 years ago

@gregerhardt Are you okay with what I have done? Should I include/exclude any census tracts?

alex-mucci commented 3 years ago

Well I just realized that I left the highlighted census tract off (shown below). I have added that one to the list now.

image

gregerhardt commented 3 years ago

The east parts go into the water, right and are a non-issue, right? On the west side, I would leave out the sqiggly zone west of Goose Island for sure. The others I can be convinced either way. Also, don't forget to grab Navy Pier, McCormick Place and the airports as their own special zone.

alex-mucci commented 3 years ago

Yes I meant east boundaries not west. I will grab the census tracts for those areas as well.

alex-mucci commented 3 years ago

Below is what I sent Dr. Agrawal regarding the breakdown of trips in/out of the downtown zone:

I apologize for the delay in my response. I switched over to a virtual machine and the transition proved to be harder than I expected.

I have below what I think is the breakdown you were looking for. This includes all ride-hailing trips within Chicago city limits between November 2018 and December 2019. Looks like 2/3 of trips either have only their origin or destination within the tax downtown zone. Then 1/3 is either within the downtown zone or outside of the downtown zone. I used the same downtown zone that Chicago uses for their congestion-based tax (https://www.chicago.gov/city/en/depts/bacp/supp_info/city_of_chicago_congestion_pricing.html),

I have also attached the excel sheet that I used to create this table, which includes other visualizations of the data as well. Feel free to ask me any questions you have about it. The most interesting thing I found was that there doesn't seem to be a significant impact on ridership after the tax is implemented. The timeline graphs show a change in Jan. 2020, but then it looks like ridership bounces back by Feb 2020.

pic 1

pic 2

Breakdown of Downtown Zone Trips.xlsx