ILP Durham CPD: Why a site visit is important on a traffic route
1. Importance of Site Visit Prior
to Design
Stainton Lighting Design Services Ltd
Kevin Hill
Junior Lighting Designer
2. My Background
• School into college
• Started an apprenticeship at SLDS
• Office based lighting designer
• Developing experience in civils or installation
3. A19 Easington Stockton Road
• Traffic route
• Full new scheme
• Everything done to current
standards in terms of passive
columns and barrier working
widths
• We were awaiting TOPO but
needed to start or you may not
get TOPO
• First approach (outline positions
at max spacings)
4. Site Visit
• Google maps
• Plans with proposed locations
• Without site visit some problems may not of been identified
• Maybe identified further down the line
• Doubling back or starting again
• Scheme hitting the ground then finding the problems
8. Changes to Design
• Fixed Location items affecting design
• Overhead lines
• Bridge decks
• Walls
• Start and end of the scheme
• Instead of max spacings we are now taking average between these
fixed positions
9. Safety Barrier
• Why are the barriers
there?
• What do they do?
• Working width of barrier
• Setback from 2m to
3m+
11. Barrier Standards Requirements
• CD377 (Requirements for road restraint systems) was TD19/06
• BSEN1317-2 (Compliant Road Restraint Systems)
Type Containment
Level
Post Spacings Value used
after June 2005
TCB (single
sided)
N2 3.2
1.6
W6
W5
OBB (single
sided)
N2 2.4
1.2
W5
W4
Working width up to
but not exceeding
Class of working
width level
0.6 W1
0.8 W2
1.0 W3
1.3 W4
1.7 W5
2.1 W6
2.5 W7
3.5 W8
Safety barrier
containment level
(Minimum “full
height” lengths of
safety barrier) In
advance of hazard
(Minimum “full
height” lengths of
safety barrier)
Beyond hazard
Normal (N2 or N2) 30m 7.5m
Higher (H1 or H2) 30m 10.5m
Very high (H4a) 45m 18m
12. Embankments
• Google view
• Civils issue on top of lighting
design issue
• Can you avoid it?
• Weigh up stronger barrier vs
planting on embankment
(buildability and costs)