Using the Near Misses tool

What you’ll learn

The Near Misses tool lets you download g-force data into a CSV file. This is different to the near misses layer which shows you incidents on the map which you can click on for more information.

The Near-Miss tool is best used with the Near-Miss layer turned on.

Getting Near Misses Ready

• Selecting a Zone:
  • Organic polygon zone
    1. Click once on the map to start the shape.
    2. Keep clicking around the map to create your desired shape.
    3. Double click to close the shape.
    4. A zone will be added to the zones.
  • Pre-defined boundary: This tool lets you selected pre-selected boundaries such as postcodes, local government areas, and states. Each boundary will differ depending on the country you select.
  • Polygon WKT file: Available when Advanced Mode is turned on.
    1. Click once on the map to start the shape.
    2. Keep clicking around the map to create your desired shape.
    3. Double click to close the shape.
    4. A zone will be added to the zones.

Download results

Once you’ve selected your zone/s, you can click the ‘Download Results’ button and a CSV file will start downloading.

There is no Results panel in the Near-Miss tool.

What is an unsafe g-force?

Based on American research:

• Harsh braking is when the g-force value is > 0.6
• Harsh acceleration/deceleration is when the g-force value is > +/- 0.4
• Harsh swerving is when the g-force value is > +/- 0.47

As a general rule, we suggest anything that is above 0.47 or below -0.47 is considered potentially unsafe. However, g-forces should be reviewed in relation to the road context.

Further Links

• How to select a date range
• How to select a path, zone, or boundary
• Near-Miss - How to use the near-miss tool
• How do I interpret G-force Movements, Speed, and Braking and Accelerating graphs?
• Understanding Results from Compass

Goal

Try using the Near Misses tool to understand travel times, trip volumes, hourly breakdowns, and Edge Usage Ranking (EUR) across Sydney. We'll see how people travel between Manly, Macquarie University, and the Sydney Harbour Bridge.

‍

Do

1. Copy and paste the coordinates “-33.868455, 151.176267” into the Search Bar in the top left of the platform Home Page.
2. Choose the Near Misses tool from the Tool Selection panel.
3. Choose 6 Dec 2024 - 6 Jan 2025 in the Date Selection panel.
4. Select a polygon where Victoria Road intersects with the M4 in Sydney that looks like this:
   

5. Or if you know how to use WKT Files, paste this into the WKT selection tool and disable road-matching:
   
   • POLYGON ((151.17557109777897 -33.86813294807075, 151.17720042970092 -33.867679470641335, 151.1780014420449 -33.86935732509695, 151.17546186882322 -33.869954391474124, 151.17557109777897 -33.86813294807075))
6. Click 'Download Results', and open the file downloaded to your computer.

Questions

0:00

This tool allows you to download near-miss data from the map.

In order to use the Near-Miss tool, you need to have the near-miss layer turned on. The difference between the Near-miss tool and the near-miss layer is the near-miss layer will show you on the map where you have near-misses or friction loss events, whereas the Near-Miss tool will allow you to select a zone to then download that information into a CSV file.

0:27

There are a couple of ways that you can select a zone. The first one is using a WKT file to create a polygon. The second is that you can create an organic polygon to select a certain area. And then lastly, we have pre-selected boundaries. This allows you to select pre-selected areas - such as postcodes, suburbs, or SA2s, SA3s, SA4s - to download all near-miss information within that boundary for the dates that you have selected.