7A. Traffic Signal Timing Flashcards
(e.g., freeway merge, entrance and exit design, horizontal design, vertical design)
1
Q
Where can Pedestrian Intervals and Signal Phases be found
A
MUTCD Section 4E.06
2
Q
What is the formula for Yellow Change Interval?
A
PE Handbook 5.4.3.1
Y=t+ ((v) / (2a*2Gg))
where
Y =calculatedyellowtime
t= reaction time (typically 1 second if no other information is provided)
v =designspeed(ft/sec)
a=decelerationrate(typically10ft/sec2ifnootherinformationis provided)
g =accelerationduetogravity
G =gradeofapproach
3
Q
What is the formula for Red Clearance Interval?
A
PE Handbook 5.4.3.2
R = (w + L) / v
where
R =calculatedredclearanceintervaltime
w =widthofintersectionmeasuredfromnearside stop line to far side pointofclearance
L = length of vehicle (typically 20 ft if no other information is provided)
v =designspeed(ft/sec)
