3C. Cross-section elements Flashcards
(e.g., lane widths, shoulders, bike lane, sidewalks, retaining walls)
1
Q
Which book and chapter can cross-section elements be found?
A
AASHTO Green book Chapter 4
2
Q
What are the common cross section areas to consider
A
Border Area - the area between the roadway and ROW line
Traveled way - the part of the road that can be driven on
Roadway - The travelled way and the shoulder
3
Q
What is the accepted rate of cross slopes
A
AASHTO Chapter 4
1.5% to 2% for paved
2% to 6% for unpaved
4
Q
What is the standard lane size
A
AAHSTO chapter 4
9’ to 12’ with 12’ being the most common
AASHTO Chapters 5-8 will have more detailed information on lane widths depending on the roadway type.
5
Q
What are acceptable shoulder widths
A
10’ is the normal shoulder width
2’ minimum
