Textbook Notes (363,233)
United States (204,452)
ENGR 1166 (15)
Chapter 4

ENGR 1166 Chapter 4: Civil Engr: Intro to Intersection Design

3 Pages
Unlock Document

University of Connecticut
ENGR 1166
Dean Burkey

Intersection Design ● Intersections - area where two or more streets join or cross ○ Multimodal: cars, buses, trucks, bicycles, pedestrians ○ Areas where vehicle, bicycles, and pedestrians con into direct conflict ○ Must manage these that provide safety, and allows efficient movement of vehicles ● Functional area of an intersection ○ Includes all areas needed for every mode of travel ○ ex. traffic lanes, crosswalks, medians, sidewalks ● Importance of intersections ○ Centers of activities ■ Travel destinations concentrated area surrounding intersection ○ Points of conflict in transportation system ■ Motor vehicles, pedestrians, bicycles cross paths in intersection ○ Focal point of traffic operations ■ Movement in constrained by traffic control devices (stop signs, traffic signals) ■ Can limit capacity of intersecting roadways ● Intersections and safety ○ 20% of traffic fatalities and 50% of traffic injuries occur at intersections (signalized and unsignalized) ○ There are 32 points of conflict between vehicles in a two -lane, four-way intersection ■ Point of conflict - point where path of two vehicles/pedestrians diverge, merge or cross ● Directly related to number of collisions ■ Merging/diverging - joining or separating of traffic ● Key Elements of an Intersection ○ Major street - higher traffic flower, larger cross section (compared to a minor street) ○ Intersections are defined by angle of intersection ■ Most form a right angle ■ Skewed intersection (pose greater safety challenges) ○ Intersecting legs - encompass ■ Approach legs and departure legs ○ Crosswalks are included also as part of the intersection ● Categorizing intersections ○ Simple - cross section and number of lanes do not change ○ Flared - have additional through lanes, or auxilliary turn lanes (expand cross section of roadway) ○ Channelized - have islands to separate auxiliary turn lanes (large) ○ Roundabout - traffic moves altogether about a centralized island (one way circular flow of traffic) ● Design Elements ○ Alignment, pavement corner radius, auxiliary lanes, channelized lanes, islands, roundabouts, crosswalks ○ Horizontal alignment ■ Preferred alignment → roads intersect at 90 degree angles ■ When intersection occurs at a skewed angle ● 1) less visibility of approaching vehicles ● 2) increased amount of pavement needed to allow for turns ● 3) longer pedestrian crossing distances ■ Pavement corner radius ● Curves that conn
More Less

Related notes for ENGR 1166

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.