FDOT Roadway Design and Geometric Standards 2 — Questions and Answers
Question 1: What is the minimum required stopping sight distance (SSD) at a design speed of 55 mph per FDOT standards?
- 305 feet
- 360 feet (Correct answer)
- 495 feet
- 645 feet
Correct answer: 360 feet
FDOT and AASHTO require approximately 360 feet of stopping sight distance at a design speed of 55 mph, based on reaction time and braking distance.
Question 2: What does 'K-value' represent in FDOT vertical curve design?
- The ratio of curve length to algebraic difference in grades (Correct answer)
- The maximum grade change per station
- The pavement cross-slope in percent
- The coefficient of friction for wet pavement
Correct answer: The ratio of curve length to algebraic difference in grades
The K-value is the length of vertical curve (in feet) per 1% change in grade, used to determine adequate sight distance over crest curves and comfort on sag curves.
Question 3: According to FDOT standards, what is the maximum grade allowed for a principal arterial in a level terrain area?
- 3%
- 5%
- 6% (Correct answer)
- 8%
Correct answer: 6%
FDOT allows a maximum grade of 6% on principal arterials in level terrain, balancing drainage needs with truck performance requirements.
Question 4: What is the purpose of a 'clear zone' in FDOT roadway design?
- Area cleared of vegetation for sight distance
- The roadside area clear of obstacles where an errant vehicle can recover (Correct answer)
- The lane width minus the vehicle width
- The area between travel lanes reserved for emergency vehicles
Correct answer: The roadside area clear of obstacles where an errant vehicle can recover
The clear zone is the unobstructed roadside area adjacent to the travel lane where an errant vehicle can recover control or stop safely without hitting fixed objects.
Question 5: What FDOT publication establishes access management standards for the State Highway System?
- FDOT Standard Specifications
- FDOT Access Management Manual (Correct answer)
- FDOT Drainage Manual
- FDOT Plans Preparation Manual
Correct answer: FDOT Access Management Manual
The FDOT Access Management Manual establishes standards for controlling access points, medians, and turn lanes on the State Highway System.
Question 6: What does 'functional classification' of a roadway determine in FDOT design?
- The pavement structural design requirements
- The geometric design standards and access management requirements applied to the road (Correct answer)
- The speed limit posted on the roadway
- The maintenance responsibility of the road
Correct answer: The geometric design standards and access management requirements applied to the road
Functional classification (principal arterial, minor arterial, collector, local) determines the geometric design standards, access management requirements, and level of service standards applied.
FDOT Roadway Design and Geometric Standards 2
What is the minimum required stopping sight distance (SSD) at a design speed of 55 mph per FDOT standards?