Highway Geometric Design

Question 1

What is typically considered the main movement stage during motor vehicle travel?

Answer 1

Uninterrupted high-speed flow like a freeway

APoGDoHaS Chapter 1 Page 1

Question 2

What is typically considered the transition stage during motor vehicle travel?

Answer 2

When vehicles reduce speed from freeway ramps

APoGDoHaS Chapter 1 Page 1

Question 3

What is typically considered the distribution stage during motor vehicle travel?

Answer 3

A moderate speed arterial that brings people closer to the vicinity of their destination neighborhood

(APoGDoHaS Chapter 1 Page 1)

Question 4

What is typically considered the collection stage during motor vehicle travel?

Answer 4

A road that penetrates the neighborhood a person is traveling to

(APoGDoHaS Chapter 1 Page 2)

Question 5

What is typically considered the access stage during motor vehicle travel?

Answer 5

A local road that provides direct approaches to Buisnesses or residences.

(APoGDoHaS Chapter 1 Page 2)

Question 6

What is typically considered the terminal stage during motor vehicle travel?

Answer 6

Parking

APoGDoHaS Chapter 1 Page 2

Question 7

What are the six recognizable stages in most motor vehicle trips?

Answer 7

-Main movement, transition, distribution, collection, access, and termination.

(APoGDoHaS Chapter 1 Page 1)

Question 8

What are the two major considerations in classifying highway and street networks functionality?

Answer 8

Access and Mobility

APoGDoHaS Chapter 1 Page 7

Question 9

Why is regulated limitation of access needed on arterial roads?

Answer 9

To enhance the primary function of mobility.

APoGDoHaS Chapter 1 Page 7

Question 10

What is the primary function of local roads?

Answer 10

To provide direct access to shops, restaurants, and homes etc.

(APoGDoHaS Chapter 1 Page 7)

Question 11

Describe collector roads and how they relate to access and mobility.

Answer 11

Collector roads offer approximately balanced service for both access and mobility.

(APoGDoHaS Chapter 1 Page 7)

Question 12

A city with what population or higher is considered an urban area based on Federal Highway Functional Classification?

Answer 12

Urban areas are those with a population of 5,000 or more

APoGDoHaS Chapter 1 Page 8

Question 13

What are the four general classes of design vehicles?

Answer 13

Passenger cars
Buses
Trucks
Recreational vehicles

(APoGDoHaS Chapter 2 Page 1)

Question 14

When should a passenger car be used as the main traffic generator?

Answer 14

A parking lot or series of parking lots

APoGDoHaS Chapter 2 Page 2

Question 15

When should a two-axel single unit truck be used as the design vehicle?

Answer 15

For intersection design of residential street and park roads.

(APoGDoHaS Chapter 2 Page 2)

Question 16

When should a three-axel single-unit truck be used as the design vehicle?

Answer 16

For the design if collector streets and other facilities where larger single unit trucks are likely

(APoGDoHaS Chapter 2 Page 2)

Question 17

When should a city transit bus be used as the design vehicle?

Answer 17

For state highway intersections with city streets that are designated bus routes where relatively few large trucks travel

(APoGDoHaS Chapter 2 Page 2)

Question 18

For design vehicle dimensions, what would “WB” stand for?

Answer 18

Effective vehicle wheelbase, or the distance between axel groups, starting at the front and working towards the back of each unit

(APoGDoHaS Chapter 2 Page 4)

Question 19

For design vehicle dimensions, what would “S” stand for?

Answer 19

The distance from the rear effective axel to the hitch point or point of articulation.

(APoGDoHaS Chapter 2 Page 4)

Question 20

For design vehicle dimensions, what does “T” stand for?

Answer 20

The distance from the hitch point or point of articulation measured back to the center of the next axel or the center of the tandem axel assembly.

(APoGDoHaS Chapter 2 Page 4)

Question 21

For design vehicle dimensions, what would “CTR” stand for?

Answer 21

Centerline turning radius

APoGDoHaS Chapter 2 Page 5

Question 22

What is the definition of the “Curb-to-curb turning radius”, with respect to design vehicles?

Answer 22

The circular arc formed by the turning path radius of the front outside tire of a vehicle.

(APoGDoHaS Chapter 2 Page 8)

Question 23

What is the definition of a “Wall-to-wall turning radius”, with respect to design vehicles?

Answer 23

The circular arc formed by the turning path radius of the front side overhang of a vehicle.

(APoGDoHaS Chapter 2 Page 8)

Question 24

What is the definition of a “Centerline turning radius” with respect to design vehicle?

Answer 24

The turning radius of the centerline of the front axel of a vehicle with its steering wheels at the lock position

(APoGDoHaS Chapter 2 Page 8)

Question 25

What is the definition of “offtracking” with respect to design vehicle turning path?

Answer 25

The difference in the paths of the front and rear wheels of a tractor/semitrailer as it negotiates a turn.

(APoGDoHaS Chapter 2 Page 8)

Question 26

What is the definition of “Swept path width” with respect to design vehicle turning?

Answer 26

The amount of roadway width that a truck covers in negotiating a turn that is equal to the width of the tractor/semitrailer plus the offtracking.

(APoGDoHaS Chapter 2 Page 8)

Question 27

For design vehicle dimensions, what would “AA” stand for?

Answer 27

Articulation angle

APoGDoHaS Chapter 2 Page 8

Question 28

How can you calculate the centerline turning radius from the effective wheel base and the maximum steering angle?

Answer 28

Divide the effective wheelbase by the sin of the maximum steering angle

WB / sin( max steering angle) = CTR

(APoGDoHaS Chapter 2 Page 20)

Question 29

Acceleration and deceleration rate of vehicles are critical parameters for highway design and often govern the dimension of what types of features?

Answer 29

Intersections
Freeway ramps
Climbing or passing lanes
Turnout bays for buses

(APoGDoHaS Chapter 2 Page 33)