transportation-Civil-Engineering

i have an homework in class transportation

the book we use is

Traffic & Highway Engineering, Nicholas J. Gerber and Lester A. Hoel 5th Edition, E.I., 2015.

the homework questions is from this book

Chapter 13 questions are: ((13.2)) ((13.6)) ((13.7)) ((13.10)) ((13.12)) ((13.14))

the answers typed