Alternative approach to Corridor/Template Design - 3D Linear Method

Fellow Engineers, Modelers, Bentley Operators, etc.

Last year in July 2017 at the 9th International Visualization In Transportation Symposium I presented an abstract detailed an alternative approach to working with Corridor/template design.

This approach is called "3D Linear Method". It is the complete opposite on what Bentley encourages in their teaching workshops, and consequently the opposite what is demonstrated by every major Department of Transport I have encountered. A brief outline on how it works:

Instead of single templates/corridors spanning the whole width of each roadway alignment, the corridors are broken up by element. 1 corridor per curb, lane, shoulder, guard rail, end condition, wall, barrier, etc. Each piece is connected to each other, eventually connecting directly or indirectly to control lines.

While this creates 100's of extra corridors, the advantages make this technique far superior to the designer, and end user (client of contractor) than the current approach for the following reasons:

1) Templates are simple, easy to create, and have no complex display rules so they are functional for the novice user

2) The same template can be re-used 1000's of times, across any project, making the data consistent 100% of the time, giving reliable consistent symbology when the data is visualized

3) The consistent nature of common templates used always simpler digital quantities to be extracted, as similar objects can be collected by symbology

4) Changes are more manageable - change only the parts you need to change, and the connectivity of all the other corridors will automatically be adjusted

5) More than 1 user can work on the same road in the same section at the same time as everything is broken into smaller pieces

6) Simpler to train - for those unfamiliar with a 3D environment, this 3D Linear Method is identical to criteria

7) Processing is substantially reduced - it is quicker to process 100's of small corridors with no complex rules than 1 or 2 massive corridors with lots of display rules by a factor of 10.

This technique has been implemented across every designer I have worked directly with in Illinois over the past 4 years, and there has been 3 distinct reactions:

a) Those with some 3D knowledge embraced it fully, recognizing that this is the ONLY way to utilize the software, no exceptions

b) Those with minimal or zero 3D knowledge dismissed it entirely, citing "This is not the way Bentley teaches it"

c) Those with medium experience recognize its power, and use a toned down version of 3D Linear method - they build templates that span all lanes, 1 for shoulders, then 1 for end conditions, for example.

Overall it has been received positively from those who understand the software's limitations, and widely used across Illinois Tollway I-294 project currently underway.

This modeling technique has caused quite a controversy here from the State Government in Illinois (IDOT) due to the radically different approach. So I wanted to hear from the greater community regarding this technique.

If you would like to contact me directly about this, feel free to do so:

Alexander Badaoui, PE: P 312.467.0123 |

The presentation I made showing this in more detail is found here:

The attached PDF is a summary of the abstract presented.

This was geared towards a non-technical audience. The following power point below is more technically driven, detailing how the naming convention operates in Illinois:

Thanks in advance for your feedback on this technique.

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