Errata (book corrections)
Here you will find the errata (book corrections) that were made on the Zen Training Guides listed below:
Addendums (book updates)
There are also some addendums that were made to a few of our Zen Guides. The list of these are below:
Mark is not only a good teacher, but a good designer as well. Mark is both knowledgeable and clear in both the InRoads software and in the area of Road Design at ITD. He provides good and direct answers to questions and assists in developing solutions in the design process. He is a uniquely qualified individual. 
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