Lecture III, Tues, Feb6,2018/// lecture 3 on mooodle all

Question 1

Types of sight distances that we will study

Answer 1

1- Stopping sight distance
2-Decision sight distance
3-Passing sight distance

Question 2

Stopping sight distance (SSD)

Answer 2

Minimum sight distance required for driver
to stop a vehicle after “seeing” object in
vehicle’s path
(formula will be given)

Question 3

A properly designed roadway will provide
the minimum stopping sight distance at
every point along its length

Answer 3

True

Question 4

SSD requirements impose design controls
on elements of roadway geometry:
– Minimum length of vertical curves
– Minimum radius of horizontal curves

Answer 4

True

Question 5

SSD based on passenger car operation; trucks are not
explicitly considered
• Heavier/longer trucks need longer stopping distances,
On the other hand, a balancing factor is the height of
truck cabs which permits higher sight clearance

Answer 5

True

Question 6

Decision sight distance is required in cases

such as:

Answer 6

– Changes in roadway cross-section (lane drops (lane becomes narrower) or toll plazas (lanes that you pay to move on it ))
– Interchanges
– Area where different sources of information
(traffic, control devices, advertisements, etc.)
compete for driver’s attention

Question 7

DSD is the distance traveled while
recognizing an object or hazard, plotting an
avoidance course (accelerating for example or making a turn safely), and making the necessary
maneuvers; it is not related to stopping

Answer 7

TRue

Question 8

It is the minimum sight distance required for a 2-
lane, 2-way highway in order to permit a driver
to complete a passing maneuver:
– without colliding with the opposite vehicle
– without cutting off the passed vehicle

Answer 8

True

Question 9

look at the copybook also

Answer 9

true