Brisbane City Council has several publications which may be useful. Click on the images or the URLs below.
Transport plan for Brisbane / Brisbane City Council
Bridges for Brisbane Program / Brisbane City Council
This article Where in Brisbane do people own the most cars? has a search to find the relevant suburbs. You may need to register to view.
You can find census data on car ownership through the Brisbane Community Profiles
To get started click on the image below or go to https://www.brisbane.qld.gov.au/business-in-brisbane/data-and-economic-insights/brisbane-community-profiles
Scroll down the page until you get to: 
Choose the suburbs you are interested in and then "Number of motor vehicles per dwelling Census 2021". Then click on Create Report
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