CALIFORNIA TRAFFIC ENGINEER EXAMINATION
NEWEST 100 COMPLETE EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS LATEST VERSION
2026-2027 (100% VERIFIED ANSWERS) ALREADY
GRADED A+
Question 1
Per the California MUTCD, what is the minimum required width of a standard lane line
(broken lane marking) on a freeway?
A) 4 inches
B) 5 inches
C) 6 inches
D) 8 inches
Answer: C
Rationale: The CA MUTCD specifies that lane lines on freeways shall be 6 inches wide to
provide conspicuity and guidance. Standard lane lines on conventional roads are typically 4
inches wide, but the 6-inch width is required for high-speed freeway facilities. 8-inch wide
markings are used for certain emphasis markings. This requirement is consistent with the
national MUTCD and California amendments.
Question 2
When performing a traffic signal warrant analysis per the CA MUTCD, which warrant is
typically evaluated first if a signal is being considered due to a high frequency of right-angle
collisions?
A) Warrant 1, Eight-Hour Vehicular Volume
B) Warrant 2, Four-Hour Vehicular Volume
C) Warrant 3, Peak Hour
D) Warrant 7, Crash Experience
,Answer: D
Rationale: Warrant 7, Crash Experience, is specifically intended for locations where the crash
frequency indicates that a signal may reduce the frequency of certain crash types, such as
right-angle collisions. The engineer must first evaluate whether the crash frequency meets the
thresholds for this warrant. If it does not, other volume-based warrants may be considered.
The other warrants are volume-based and may not directly address a crash problem.
Question 3
A two-lane highway has a design speed of 60 mph. According to Caltrans HDM, what is the
minimum passing sight distance required for this design speed?
A) 500 ft
B) 700 ft
C) 800 ft
D) 1,000 ft
Answer: C
Rationale: The AASHTO Green Book and Caltrans HDM specify a minimum passing sight
distance of 800 ft for a 60 mph design speed, assuming the passing vehicle accelerates from
the speed of the passed vehicle and a safe clear distance is maintained. At higher design
speeds, the passing sight distance increases significantly. 500 ft is insufficient, and 1,000 ft is
required for 70 mph.
Question 4
In a standard four-leg signalized intersection with permitted left turns, the clearance interval
(yellow change plus all-red) for a particular phase is calculated to be 4.5 seconds. The
California MUTCD requires the yellow change interval to be at least:
A) 3.0 seconds
B) 3.5 seconds
C) 4.0 seconds
D) A duration determined by the 85th-percentile approach speed
Answer: D
Rationale: The CA MUTCD (and national MUTCD) requires that the yellow change interval be
calculated based on the approach speed and other factors, but the minimum is generally 3.0
seconds; however, the duration shall be determined by engineering practice, typically using
the kinematic equation that considers perception-reaction time, approach speed, and
,deceleration rate. The answer “determined by the 85th-percentile approach speed” is
consistent with the need for an engineering study, but the actual standard is that the yellow
interval shall have a minimum of 3.0 seconds and a maximum of 6.0 seconds, and shall be
based on the prevailing approach speed. The most accurate answer from the options is D, as it
reflects the engineering study requirement rather than a fixed value. None of the fixed values
(3.0, 3.5, 4.0) are always correct, as the duration varies. So D is the best answer.
Question 5
Which of the following signs is classified as a regulatory sign according to the California
MUTCD?
A) Curve warning sign (W1-2)
B) Speed limit sign (R2-1)
C) Destination and distance sign (D1-1)
D) Highway exit sign with green background
Answer: B
Rationale: Regulatory signs inform road users of traffic laws or regulations that must be
obeyed. Speed limit signs (R series) are regulatory. Warning signs (W series) indicate potential
hazards. Guide signs (D series and green signs) provide directional information. Therefore,
only the speed limit sign is regulatory.
Question 6
The Highway Capacity Manual (HCM) defines the level of service (LOS) for a freeway segment
based primarily on:
A) Travel speed and volume-to-capacity ratio
B) Density in passenger cars per mile per lane
C) Number of lanes
D) Presence of intelligent transportation systems
Answer: B
Rationale: For freeway basic segments, the LOS is determined by density (pc/mi/ln), which is a
direct measure of the quality of traffic flow and driver maneuverability. Speed is used for
some other facility types (e.g., urban streets). Volume-to-capacity ratio influences density but
is not the primary measure. Density thresholds define each LOS from A to F.
, Question 7
A traffic engineer is designing a roundabout in California. Per Caltrans policy, the design of the
central island and the circulatory roadway must ensure that the fastest path speeds through
the roundabout do not exceed:
A) 15 mph
B) 20 mph
C) 25 mph
D) 30 mph
Answer: C
Rationale: Caltrans and national roundabout guidelines recommend that the maximum entry
path radius and overall geometry should limit the fastest path speed to 25 mph for single-lane
roundabouts and 25–30 mph for multi-lane roundabouts, with a typical target of 25 mph or
less for the fastest path. This promotes safety by reducing speed differentials. 15 mph is overly
restrictive for most roundabouts, and 30 mph is too high.
Question 8
Which of the following California Vehicle Code sections empowers a local authority to
establish prima facie speed limits on streets based on an engineering and traffic survey?
A) CVC 22350
B) CVC 22352
C) CVC 22358
D) CVC 40802
Answer: C
Rationale: CVC 22358 permits local authorities to declare speed limits greater than 25 mph
(but not exceeding 55 mph on highways other than freeways) based on an engineering and
traffic survey. CVC 22350 is the basic speed law. CVC 22352 sets prima facie speed limits for
specific locations. CVC 40802 relates to speed trap prohibition.
Question 9
In signal timing design, the “lost time” per phase is most closely associated with:
A) The green time during which vehicles do not discharge
B) The sum of the start-up lost time and the clearance lost time
C) The time allocated to pedestrians
D) The time needed for the controller to cycle
NEWEST 100 COMPLETE EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS LATEST VERSION
2026-2027 (100% VERIFIED ANSWERS) ALREADY
GRADED A+
Question 1
Per the California MUTCD, what is the minimum required width of a standard lane line
(broken lane marking) on a freeway?
A) 4 inches
B) 5 inches
C) 6 inches
D) 8 inches
Answer: C
Rationale: The CA MUTCD specifies that lane lines on freeways shall be 6 inches wide to
provide conspicuity and guidance. Standard lane lines on conventional roads are typically 4
inches wide, but the 6-inch width is required for high-speed freeway facilities. 8-inch wide
markings are used for certain emphasis markings. This requirement is consistent with the
national MUTCD and California amendments.
Question 2
When performing a traffic signal warrant analysis per the CA MUTCD, which warrant is
typically evaluated first if a signal is being considered due to a high frequency of right-angle
collisions?
A) Warrant 1, Eight-Hour Vehicular Volume
B) Warrant 2, Four-Hour Vehicular Volume
C) Warrant 3, Peak Hour
D) Warrant 7, Crash Experience
,Answer: D
Rationale: Warrant 7, Crash Experience, is specifically intended for locations where the crash
frequency indicates that a signal may reduce the frequency of certain crash types, such as
right-angle collisions. The engineer must first evaluate whether the crash frequency meets the
thresholds for this warrant. If it does not, other volume-based warrants may be considered.
The other warrants are volume-based and may not directly address a crash problem.
Question 3
A two-lane highway has a design speed of 60 mph. According to Caltrans HDM, what is the
minimum passing sight distance required for this design speed?
A) 500 ft
B) 700 ft
C) 800 ft
D) 1,000 ft
Answer: C
Rationale: The AASHTO Green Book and Caltrans HDM specify a minimum passing sight
distance of 800 ft for a 60 mph design speed, assuming the passing vehicle accelerates from
the speed of the passed vehicle and a safe clear distance is maintained. At higher design
speeds, the passing sight distance increases significantly. 500 ft is insufficient, and 1,000 ft is
required for 70 mph.
Question 4
In a standard four-leg signalized intersection with permitted left turns, the clearance interval
(yellow change plus all-red) for a particular phase is calculated to be 4.5 seconds. The
California MUTCD requires the yellow change interval to be at least:
A) 3.0 seconds
B) 3.5 seconds
C) 4.0 seconds
D) A duration determined by the 85th-percentile approach speed
Answer: D
Rationale: The CA MUTCD (and national MUTCD) requires that the yellow change interval be
calculated based on the approach speed and other factors, but the minimum is generally 3.0
seconds; however, the duration shall be determined by engineering practice, typically using
the kinematic equation that considers perception-reaction time, approach speed, and
,deceleration rate. The answer “determined by the 85th-percentile approach speed” is
consistent with the need for an engineering study, but the actual standard is that the yellow
interval shall have a minimum of 3.0 seconds and a maximum of 6.0 seconds, and shall be
based on the prevailing approach speed. The most accurate answer from the options is D, as it
reflects the engineering study requirement rather than a fixed value. None of the fixed values
(3.0, 3.5, 4.0) are always correct, as the duration varies. So D is the best answer.
Question 5
Which of the following signs is classified as a regulatory sign according to the California
MUTCD?
A) Curve warning sign (W1-2)
B) Speed limit sign (R2-1)
C) Destination and distance sign (D1-1)
D) Highway exit sign with green background
Answer: B
Rationale: Regulatory signs inform road users of traffic laws or regulations that must be
obeyed. Speed limit signs (R series) are regulatory. Warning signs (W series) indicate potential
hazards. Guide signs (D series and green signs) provide directional information. Therefore,
only the speed limit sign is regulatory.
Question 6
The Highway Capacity Manual (HCM) defines the level of service (LOS) for a freeway segment
based primarily on:
A) Travel speed and volume-to-capacity ratio
B) Density in passenger cars per mile per lane
C) Number of lanes
D) Presence of intelligent transportation systems
Answer: B
Rationale: For freeway basic segments, the LOS is determined by density (pc/mi/ln), which is a
direct measure of the quality of traffic flow and driver maneuverability. Speed is used for
some other facility types (e.g., urban streets). Volume-to-capacity ratio influences density but
is not the primary measure. Density thresholds define each LOS from A to F.
, Question 7
A traffic engineer is designing a roundabout in California. Per Caltrans policy, the design of the
central island and the circulatory roadway must ensure that the fastest path speeds through
the roundabout do not exceed:
A) 15 mph
B) 20 mph
C) 25 mph
D) 30 mph
Answer: C
Rationale: Caltrans and national roundabout guidelines recommend that the maximum entry
path radius and overall geometry should limit the fastest path speed to 25 mph for single-lane
roundabouts and 25–30 mph for multi-lane roundabouts, with a typical target of 25 mph or
less for the fastest path. This promotes safety by reducing speed differentials. 15 mph is overly
restrictive for most roundabouts, and 30 mph is too high.
Question 8
Which of the following California Vehicle Code sections empowers a local authority to
establish prima facie speed limits on streets based on an engineering and traffic survey?
A) CVC 22350
B) CVC 22352
C) CVC 22358
D) CVC 40802
Answer: C
Rationale: CVC 22358 permits local authorities to declare speed limits greater than 25 mph
(but not exceeding 55 mph on highways other than freeways) based on an engineering and
traffic survey. CVC 22350 is the basic speed law. CVC 22352 sets prima facie speed limits for
specific locations. CVC 40802 relates to speed trap prohibition.
Question 9
In signal timing design, the “lost time” per phase is most closely associated with:
A) The green time during which vehicles do not discharge
B) The sum of the start-up lost time and the clearance lost time
C) The time allocated to pedestrians
D) The time needed for the controller to cycle
