ATSSA TRAFFIC CONTROL SUPERVISOR RE-
CERTIFICATION (MISSING SOME BASICS)
QUESTION AND ANSWERS (VERIFIED
ANSWERS)
**1. What is the formula for minimum taper length?**
A) L = WS² / 60 for 40 MPH or less, L = WS for 45 MPH or more
B) L = W + S
C) L = S / 2
D) L = W × S
**Answer: A) L = WS² / 60 for 40 MPH or less, L = WS for 45 MPH or more**
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**2. What does the off-peak 85th percentile speed refer to?**
A) Speed that 100% of vehicles travel
B) Speed at or below which 85% of vehicles travel in free flow conditions
C) Average speed of all vehicles
D) Speed limit for construction zones
**Answer: B) Speed at or below which 85% of vehicles travel in free flow conditions**
, ESTUDY
---
**3. What is the distance of L for 25 MPH with a 12' lane width?**
A) 100'
B) 125'
C) 245'
D) 540'
**Answer: C) 245'**
---
**4. What is the distance of L for 35 MPH with a 12' lane width?**
A) 540'
B) 660'
C) 245'
D) 780'
**Answer: A) 540'**
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