Check for Maximum Speed

[GTVic]

I'm not familiar with this software but I'm trying to help someone. They wanted a quick way to find the fastest speed for a given path. I used the following procedure which looks pretty lengthy. Any other options to determine a maximum speed?

I used the Review panel and did the following

• Vehicle Tracking Drawing Explorer
• Select the current path and click Edit
• Select Maneuvers and double-click the single entry 0001 *** Initial Model ***
• Select Speed in the Properties dialog and increase from 13.3 km/hr to 13.4 km/hr
• Close all dialogs
• The path changes to show the vehicle not making the turn
• Clicking Design Check shows an exception "Steering Applied Too Fast" The steering has been applied faster than the vehicle capabilities will permit 37.25m from the start of the path.

[Apex-Solutions]

Hi

I will refer you to a previous post that I made.  

You can try and use Design Checks for this problem, you will, however, need to apply a formula based on road design principles to calculate your design speed based on your existing design conditions i.e. Curve length, curve radius etc.

https://forums.autodesk.com/t5/autocad-civil-3d-forum/custom-design-criteria/m-p/7029570#M334858http...

Additionally, one of my colleagues (Alastair Ridden) has created a video on our company youtube channel about design checks.  https://www.youtube.com/watch?v=iXtJqntEvgg 

You will be able to apply this formula on the various curves in question and review the results to find your maximum possible speed based on that.

I hope this helps.

Marnus van Staden

Technical consultant & Civil 3D support Specialist

Prokon Software Consultants 

[GTVic]

Hi, Thanks for the information but I think that would not take into account the type of vehicle. I believe the solution would need to involve the Vehicle Tracking software.

[Apex-Solutions]

HI

I am sorry that this will not work for you.  The method that you are describing seems to be the only way, although I do not remember the need to go to the AVT drawing explorer to see this limit, I tried a few times to see if it will show me the limit as I place the vehicle on the path but unfortunately I could not replicate this, my thinking is that this was a feature on AVT 2016 and has since been moved.  I will continue looking...

In the end, it all boils down to formula.  Is there maybe one that you know of that can be used to calculate this?

Also, I would then suggest posting this form on the ideas section for AVT to see if Autodesk will implement something like this in a future release.

Regards

Marnus van Staden

Technical consultant & Civil 3D support Specialist

Prokon Software Consultants