[aprssig] Crash symbol

[Ed L. Locklear, KF4CHG]

To the Group,

What would be a proper symbol to use for an object to post for a major 
accident involving vehicles?

I know there is one for aircraft crash site however, I've never seen one 
used for major accidents to be used for an Interstate or US highways.

Or would it not be advisable to use an object for such incidents where 
there is a complete shutdown in any one direction or both?  This would 
also include chemical spills etc.

Ed, KF4CHG