TII Publications
DN-GEO-03060
Geometric Design of Junctions (priority junctions, direct accesses, roundabouts, grade
separated and compact grade separated junctions)
April 2017
Page 162
8.5
Specific Road User Requirements
8.5.1
Use by Drivers of Agricultural Vehicles
It is intended that compact grade separations shall be used to accommodate the requirements for
large, slow-moving agricultural vehicles. Careful consideration must be given to the combined effect
of the gradient and superelevation to ensure that high loads are not subject to sudden shifts caused
by rapid changes in crossfall.
Where farm or field accesses on the mainline are situated close to the compact grade separated
junction consideration should be given to joining them to the compact connector road.
8.5.2
Use for Farm Animals
Where farms are adjacent to compact grade separated junctions it may be necessary to provide cattle
grids on the minor road approach or on the accommodation road approach to the junction.
8.5.3
Requirement for Hardened Verges
Where there is expected usage by a combination of equestrians, agricultural vehicles and farm
animals, hardened verges should be considered on the compact connector road to prevent damage
to the verge and drainage and to encourage these users to travel more safely and comfortably off the
main carriageway.
TII Publications
DN-GEO-03060
Geometric Design of Junctions (priority junctions, direct accesses, roundabouts, grade
separated and compact grade separated junctions)
April 2017
Page 163
9.
References
9.1
TII Publications (Standards)
a)
DN-STR-03005, Design Criteria for Footbridges
b)
DN-GE0-03030, Guidance on Minor Improvements to
National Roads
c)
DN-GEO-03031, Rural Road Link Design
d)
DN-GEO-03040, Subways for Pedestrians and Pedal Cyclists
–
Layout and
Dimensions
e)
DN-GEO-03041, The Design of Major Interchanges
f)
DN-GEO-03044, The Geometric Layout of Signal-Controlled Junctions and
Signalised Roundabouts
g)
DN-REQ-03034
Safety Barriers
h)
DN-GEO-03036, Cross Sections and Headroom
i)
DN-GEO-03046, L The Location and Layout of Lay-bys and Location Markers
j)
DN-GE0-03047, Rural Cycleway Design (Offline)
k)
DN-LHT-03038, Design of Lighting for the Strategic Motorway and All Purpose
Trunk Road Network
l)
AM-PAV-06045, Management of Skid
Resistance
m)
DN-PAV-03023, Surfacing Materials for New and Maintenance Construction, for
Use in Ireland
9.2
Transport Infrastructure Ireland Publications
a)
Guidelines on Traffic Calming for Towns and Villages on National Routes; 1999
b)
Road
Collision Facts; Ireland; 2004
9.3
Traffic Sign Regulations
c)
Traffic Signs Manual. Department of Transport.
9.4
UK, Design Manual for Roads and Bridges Standards
9.4.1
Volume 6
–
Road Geometry, Section 2 - Junctions
a)
TD 16/07 Geometric Design of Roundabouts
b)
TD 22/06 Layout of Grade Separated Junctions
c)
TD 40/94 Layout of Compact Grade Separated Junctions
d)
TD 42/95 Geometric Design of Major/Minor Priority Junctions
e)
TD 41/95 Vehicular Access to All-Purpose Trunk Roads