Lecture 6: Stop Sign Control & Signalized intersections & Design LOS. Lecture objectives: By the end of this lecture the student will be able to:. Explain there is hierarchy of intersection control Use the warrants for 2-way stop control Evaluate traffic signal warrants (by volume only)
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Lecture objectives: By the end of this lecture the student will be able to:
Intersection Control Options: How much judgment can drivers safely exercise to avoid collisions? Three levels of control are available. Which one will be proper for the Moark Junction in the future?
Level II Control: STOP Control Design LOSWarrants for two-way STOP sign
16.3.1 Two-way stop control
Because the STOP sign causes a substantial inconvenience to motorists, it should be used only where warranted. A STOP sign may be warranted where one or more of the following conditions exist:
Advantages of traffic signal control
Disadvantages of traffic signal control Design LOS
Warrants for traffic signals Design LOSData requirements
Warrants Design LOS
MUTCD 2000 has 8 warrants for a traffic signal. They are guides, not specifications. Use professional judgments. (Note MUTCD 2009 became effective January 15, 2010. Two years to comply.
Min. vehicle volume: Principal factor is the intersection traffic volume. Must satisfy for each of any 8 hour of an average day.
Interruption of continuous traffic: The volume requirements must be met for each of any 8 hours of an average day.
Combination of warrants: Only in exceptional cases. When none of them are satisfied but when the first two warrants of Warrant 1 are satisfied to the extent of 80% of the stipulated volumes.
Check for each of any 4 hr of an average day
Justified where traffic condition during 1 hr of the day result in undue delay to traffic on the minor street. (factories, office park etc.)
This applies to cases in which STOP control is already in effect for the minor road. Cannot jump from no-contro or YIELD to signals.
This warrant is satisfied when the delay during any four consecutive 15-minute periods on one of the minor-street approaches (one direction only) controlled by a STOP sign is equal to or greater than specified levels and the same minor-street approach (one direction only) volume and the total intersection entering volume are equal to or greater than the specified levels:
Moark Junction: Does it warrant a signal Design LOSin 2033 in terms of Warrant 1if the traffic growth rate you decided to use is applied to this intersection?