ATSSA
Traffic Control Supervisor Re-Certification | Practice Questions,
Answers & Detailed Rationales | TCS Study Guide
Resource Features
➢ Traffic Supervisor practice questions
➢ Correct answers with explanations
➢ Comprehensive exam review
➢ Work-zone safety practice
➢ Temporary traffic-control review
,ATSSA Traffic Control Supervisor Re-Certification |
Practice Questions, Answers & Detailed Rationales
| TCS Study Guide
1. What is the formula for minimum taper length?
A) L = WS for 40 MPH or less; L = (WS²)/60 for 45 MPH or more
B) L = (WS²)/60 for 40 MPH or less; L = WS for 45 MPH or more
C) L = W/S for all speeds
D) L = S²/W for all speeds
Correct Answer: B
𝑊𝑆 2
Rationale: For 40 MPH or less, use 𝐿 = . For 45 MPH or
60
more, use 𝐿 = 𝑊𝑆.
2. What speed is used in taper length formulas?
A) Posted speed limit
B) Off-peak 85th percentile speed
C) Average annual daily traffic speed
D) Design speed
,Correct Answer: B
Rationale: The off-peak 85th percentile speed is the speed at or
below which 85% of vehicles travel in free-flow conditions.
3. What is the distance of L for 25 MPH with a 12-ft
lane width?
A) 125 ft
B) 245 ft
C) 540 ft
D) 660 ft
Correct Answer: A
12×252
Rationale: 𝐿 = = 125 ft.
60
4. What is the distance of L for 35 MPH with a 12-ft
lane width?
A) 125 ft
B) 245 ft
C) 540 ft
D) 660 ft
, Correct Answer: B
12×352
Rationale: 𝐿 = = 245 ft.
60
5. What is the distance of L for 45 MPH with a 12-ft
lane width?
A) 125 ft
B) 245 ft
C) 540 ft
D) 660 ft
Correct Answer: C
Rationale: At 45 MPH or more, use 𝐿 = 𝑊𝑆 = 12 × 45 = 540 ft.
6. What is the distance of L for 55 MPH with a 12-ft
lane width?
A) 540 ft
B) 660 ft
C) 780 ft
D) 1000 ft
Correct Answer: B
Rationale: 𝐿 = 𝑊𝑆 = 12 × 55 = 660 ft.
Traffic Control Supervisor Re-Certification | Practice Questions,
Answers & Detailed Rationales | TCS Study Guide
Resource Features
➢ Traffic Supervisor practice questions
➢ Correct answers with explanations
➢ Comprehensive exam review
➢ Work-zone safety practice
➢ Temporary traffic-control review
,ATSSA Traffic Control Supervisor Re-Certification |
Practice Questions, Answers & Detailed Rationales
| TCS Study Guide
1. What is the formula for minimum taper length?
A) L = WS for 40 MPH or less; L = (WS²)/60 for 45 MPH or more
B) L = (WS²)/60 for 40 MPH or less; L = WS for 45 MPH or more
C) L = W/S for all speeds
D) L = S²/W for all speeds
Correct Answer: B
𝑊𝑆 2
Rationale: For 40 MPH or less, use 𝐿 = . For 45 MPH or
60
more, use 𝐿 = 𝑊𝑆.
2. What speed is used in taper length formulas?
A) Posted speed limit
B) Off-peak 85th percentile speed
C) Average annual daily traffic speed
D) Design speed
,Correct Answer: B
Rationale: The off-peak 85th percentile speed is the speed at or
below which 85% of vehicles travel in free-flow conditions.
3. What is the distance of L for 25 MPH with a 12-ft
lane width?
A) 125 ft
B) 245 ft
C) 540 ft
D) 660 ft
Correct Answer: A
12×252
Rationale: 𝐿 = = 125 ft.
60
4. What is the distance of L for 35 MPH with a 12-ft
lane width?
A) 125 ft
B) 245 ft
C) 540 ft
D) 660 ft
, Correct Answer: B
12×352
Rationale: 𝐿 = = 245 ft.
60
5. What is the distance of L for 45 MPH with a 12-ft
lane width?
A) 125 ft
B) 245 ft
C) 540 ft
D) 660 ft
Correct Answer: C
Rationale: At 45 MPH or more, use 𝐿 = 𝑊𝑆 = 12 × 45 = 540 ft.
6. What is the distance of L for 55 MPH with a 12-ft
lane width?
A) 540 ft
B) 660 ft
C) 780 ft
D) 1000 ft
Correct Answer: B
Rationale: 𝐿 = 𝑊𝑆 = 12 × 55 = 660 ft.
