Week 3 - Priority Intersections

Question 1

what is the design standard that is used for info on road.

Answer 1

DMRB - Design manual for roads and bridges - motorways and trunk roads on the strategic road network (SRN) managed by national highways

Question 2

what are the different types of priority intersections

Answer 2

crossroads
T-junctions
Skew or Y-junctions
Staggered junctions

Question 3

what are the different layouts of priority intersections?

Answer 3

Simple
ghost island
localised single-lane dualling
dual carriage

Question 4

what should be considered when located a T-section on a bend?

Answer 4

minor roads should be placed outside the curve

Question 5

how should visibility be measured

Answer 5

horizontally and vertically

Question 6

what are the considerations of vertical

Answer 6

drivers eye height to be 1.05m - 2m

drivers need to be able to see obstruction 2m high down to 600mm from road

Question 7

what is the x distance on the horizontal visilibity envelope and what are the typical values

Answer 7

minor road visibility setback distance

typical values: 2m, 2.4m, 4.5m, 9m

Question 8

what is the y distance on the horizontal visilibity envelope

Answer 8

major road visibility distance measure along the kerb line

Question 9

why is a vehicle swept path designed

Answer 9

to achieve standard corner radii for large vehicle