Geometric Design

Question 1

Divisions of Highway Design

Answer 1

Geometric Design
Intersection Design
Highway Drainage Design
Pavement Design
Earthworks
Road Facilities
Roadway lighting

Question 2

is one of the divisions of highway design concerned with the positioning of the physical elements of the roadway according to standards and constraints

Answer 2

GEOMETRIC DESIGN OF HIGHWAY

Question 3

is the route of the road, defined as a series of horizontal tangents and curves.

Answer 3

Alignment (Horizontal –Plan)

Question 4

is the vertical aspect of the road, including crest and sag curves, and the straight grade lines connecting them.

Answer 4

Grade line (Vertical -Profile)

Question 5

shows the position and number of vehicle and bicycle lanes and sidewalks, along with their cross slope or banking.

Answer 5

Cross section

Question 6

also show drainage features, pavement structure and other items outside the category of geometric design.

Answer 6

Cross section

Question 7

Geometric Design Elements

Answer 7

Cross Section
Combination of Horizontal and Vertical Alignment
Design parameters (speed, vehicle, volume)
Drainage
Sight distance (Visibility)
Horizontal Alignment (curves, radius of curvature, super-elevation)
Vertical Alignment (vertical curve, gradient)

Question 8

Design speeds ranging from ______ for local streets, and _______ for collector streets

Answer 8

30 to 50 kph ; 50 kph or higher

Question 9

______ other than expressways should be designed for speeds of 60 to 120 kph, depending on terrain, driver expectancy

Answer 9

Rural arterials

Question 10

________ should be designed for speeds of 50 to 100kph

Answer 10

Urban arterials

Question 11

_______ should be designed for speeds not less than 80 kph.

Answer 11

Expressways

Question 12

At ________ a rider or driver has less time to react to a situation and therefore there is the likelihood that an error will result in a crash

Answer 12

higher running speeds

Question 13

Momentum and kinetic energy of a vehicle increases rapidly with _______

Answer 13

speed

Question 14

The distance at which a driver of a vehicle can see an object ahead of time.

Answer 14

Sight Distance

Question 15

Based from AASHTO Greenbook:
Height of Driver’s Eye
_______ = (for passenger cars)
________ = (for large trucks)

Answer 15

1.08 m ; 2.33 m

Question 16

Based from AASHTO Greenbook:
Height of Object
_______ = (for stopping)
_______ = (for passing)

Answer 16

0.60 m ; 1.08 m

Question 17

Based from DGCS Volume 4 (3.6.1.5):
Height of Driver’s Eye
_______ = (in all cases)

Answer 17

1.15 m

Question 18

Based from DGCS Volume 4 (3.6.1.5):
Height of Object
______ = (for stopping)
______ = (for passing)

Answer 18

0.15 m ; 1.40 m

Question 19

Types of Sight Distance

Answer 19

Stopping (Non-Passing) Sight Distance
Decision Sight Distance
Passing Sight Distance

Question 20

Available distance on a roadway to enable a vehicle traveling at the design speed to stop before reaching a stationary object

Answer 20

Stopping Sight Distance

Question 21

applied where only one obstacle must be seen in the roadway and dealt with.

Answer 21

Stopping Sight Distance

Question 22

Distance required for a driver to initiate and complete safely and efficiently the maneuver of an unexpected or otherwise difficult-to perceive information source or hazard.

Answer 22

Decision Sight Distance

Question 23

applied where numerous objects, pedestrians, vehicles or design features, complex control or complex surrounding land use, and topographic conditions must be addressed by the driver.

Answer 23

Decision Sight Distance

Question 24

It is substantially greater than the stopping sight distance.

Answer 24

Decision Sight Distance

Question 25

The sight distance long enough to enable a vehicle to overtake and pass another vehicle on a two lane highway without interference from opposing traffic.

Answer 25

Passing Sight Distance

Question 26

Distance required for a driver to see a sufficient object to complete the passing maneuver without cutting off the passed vehicle in advance of meeting an opposing vehicle appearing during maneuver.

Answer 26

Passing Sight Distance

Question 27

The overtaken vehicle travels at a

Answer 27

uniform speed (slower than design
speed)

Question 28

The passing vehicle trails the overtaken vehicle as it enters a

Answer 28

passing section

Question 29

The ______ requires a short period of time to perceive whether a clear passing section is available and to start maneuvering

Answer 29

driver

Question 30

The passing vehicle accelerates during the maneuver, during the occupancy of the left lane, at about ________ than the overtaken vehicle.

Answer 30

16 kph higher

Question 31

There is a suitable _______ length between the passing vehicle and unknown

Answer 31

clearance