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April 2014
1
Site Acceptance Testing
Ed Ashworth MIHE
Atkins Transportation
Site Acceptance Testing
• Professional Certificate
• What is Site Acceptance Testing?
• Practical Considerations
• SAT procedures
• Post SAT procedures/checks
• SAT documentation
• What next?
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Professional Certificate in Traffic Signal Control
Competency 29
• “Conduct Site Acceptance Tests for pedestrian
crossings or traffic signal schemes, including timing
adjustments”
Aims and objectives;
• Explain the purpose of SAT,
– what tests need to be carried out including electrical testing
and how the check list is used
• Demonstrate an understanding of how to carry out a
SAT and make adjustments.
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Why do we need Site Acceptance Testing?
Recap;
• Check site meets legal requirements
• Verify installation is electrically safe
• Ensure layout conforms to approved design
• Check site is acceptable for maintenance takeover
• Check signals operate safely and efficiently
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What is a Site Acceptance Test?
In simple terms…..
• Site Acceptance Testing (SAT) ensures that the equipment has
been supplied and installed in accordance with the requirements
and specifications.
• That all the component parts of the installation operate
satisfactorily, and
• That the cabling and connections are correct….
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Practical Considerations – Part 1
Who should attend SAT?
• Suitably experienced signal engineer – Represents the Highway Authority
– Ensures installation is legal, safe and fit for purpose
• Signal company engineer − Carries out testing as directed by Signal Engineer
− Rectifies any defects or faults occurring during testing
• Designer
• Maintenance contractor’s representative
• Safety auditor
• Civils contractor’s representative
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Practical considerations – Part 2
What else do we need to consider?
• Have all contractors completed their works?
• Ensure you have enough time to complete all parts of the SAT
without rushing through it
• Can tuning/validation be done immediately?
• Do you need additional people on site to assist?
• Are the weather conditions suitable?
• Good planning is essential for a trouble-free SAT
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Practical Considerations – Part 3
SAT Procedures
• Pre-commissioning site visit
• Checks before signals switched on
• Checks with signals switched on
• Agree any defects (‘snags’)
• Formal takeover of installation
• Validation/fine-tuning of operation
• Stage 3 Road Safety Audit
• Pass site details to maintenance contractor
• Add site to asset management database
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SAT Procedures;
Before switching on
• Is the site legal?
• Is the site safe?
• Are all works complete?
• Use a check list so you don’t miss
anything important
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Check site layout complies with drawing
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Check road markings are correctly laid
• Stop lines must be present or site is not legal (at crossings)
• Zigzags are legal requirement at Pelicans, Puffins and
Toucans
• Pedestrian studs must be present at
crossings
• Check all lane markings and arrows
are correctly laid
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Are the poles correctly located?
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Check nearside signals and pushbuttons are
correctly aligned
• Nearside signals should be aligned at
25 to 30 degrees to kerb
• Use ‘narrow field of view’ nearside
signals at complex junctions to
minimise ‘read through’ of signals
• Is there any “damage” on the
equipment?
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Is signal equipment
clearance from kerb
edge adequate?
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Check correct visors are
fitted to signal heads
Have the signal heads
been mounted at the
correct height?
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Is the controller correctly positioned?
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Controller base should be sealed to prevent
ingress of moisture, gas, rodents and insects
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Controller wiring should be tidy with all cables
tagged to identify destination
Like this…
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…not like this!
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Inspection chambers
• Side walls should not bow in
• Ducts should be trimmed off
• Slack cable should not be
excessive
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Check loops have been cut correctly
Are the loops positioned correctly from kerbs and road markings?
Are they correct distance from stop line?
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Ensure loop slots are
backfilled
Backfill should be flush with road
surface and not over- or under-filled
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Dropped kerbs should be
flush with carriageway
surface
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Tactile paving should conform to
the DfT’s Guidance on the use
of tactile paving
Check the layout, colour and
gradient is correct
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Dropped kerbs, tactile paving and studs should all line up
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High friction surfacing should be completed before
crossings are switched on
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Check warning signs are
installed and in correct location
Sign lighting units should be
working
If street lighting required (e.g. at
crossings) this must be working
before site switched on
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Electrical Safety Checks
Before switching on the following must be done
• Obtain Earth Loop Impedance (ELI) Test Certificate
• Check feeder pillar correctly earthed
• Check correct rated fuses used in Electricity company’s cut-out
and secondary cut-out
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ELI Test Certificate should
be obtained before the
signals are switched on
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Before switch-on check summary
• Check site layout agrees with approved drawing
• Road markings are legal – stop lines, zigzags, studs
• Signal poles correctly located
• Check all vehicle and pedestrian signals correct
• Controller wiring tidy, tagged and base sealed
• Inspection chambers correctly installed
• Loops correctly cut and backfilled
• Dropped kerbs and tactile paving
• High friction (antiskid) surfacing installed if specified
• Signing installed and illumination working
• Electrical safety checks completed
If any of above are not satisfactory should you proceed further?
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SAT Procedures;
Tests with signals switched on
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Checking signal heads
• Has contractor pre-tested signals correctly wired e.g. ‘flashing out’ each
aspect under bags?
– What if all aspects flash correctly but signals don’t switch on?
• Check all aspects are working correctly
• Be prepared to switch off if something is wrong
• Check head alignment and adjust if necessary
– Primary heads, Secondary heads, Tall poles etc
• Check green arrow aspects are aligned correctly
• Ensure heads are not obscured by vegetation or street furniture
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Controller basic checks
• Check controller in correct mode
• Check clock date/time set correctly
• Check BST advance/retard weeks or dates correct
• Test lamp dimming facility (solar cell)
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Loop detection
• Check vehicle on loop activates correct detector card
channel (observe LED)
• Is detector channel set correctly for sensitivity and
presence time?
• Use handset to check each detector channel is wired
to correct controller input
• Check speed loop pairs wired correct way round and
check speed measurement readings with handset
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MVDs
• Check aligned correctly using LED on unit
• MVD should cover same lane length as System D
loops and allow vehicle to reach stop line
• Different to System D (extensions)
• Check MVD wired to correct controller input
• Cable should be neatly zip-tied to bracket
• Plug and socket should be installed (not hardwired)
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Pedestrian detection
• Check all pushbuttons wired to correct input with handset and
wait lamps illuminate
• Make sure kerbside detector coverage set up correctly
• Walk into and out of detector footprint to check demand cancels
• Check on-crossing detectors cover entire crossing area
• Ensure on-crossing detectors extend to maximum
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Audible and tactile indicators
Check audibles can be clearly heard
Check audibles and tactile rotating cones
start and stop with green man
Consider switching off audibles overnight by
timetable if close to residential properties
Check tactile rotating cones are installed on
right-hand side of pushbutton
Simulate one and two red lamp failures on each approach
One red lamp failure should extend all intergreen to pedestrian phase
Two red lamp failures should inhibit pedestrian phase at junction or switch off all signals if mid-block crossing
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Test site-specific facilities • Speed Discrimination/ Assessment
loops
– Soundmark interface…..
• All Red extension detection
• Bus and emergency vehicle priority
• Hurry calls
• Queue detection/Call – Cancel?
• Part-time operation
(timetable/triggers?)
• Physical links to other controllers/MEC
cabinets
• Communications links?
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Remote monitoring
• Check either BT line or GSM comms
provided
• SIM card needed for GSM
• Carry out suitable checks to ensure
OMCU working correctly
• Lamp faults, mains failure and detector
faults should all be simulated
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Post SAT checks – Part 1
MOVA Testing & Validation
• MOVA loops will need careful
checking
• Ensure MOVA dataset is ready
• Allow enough time for MOVA
testing and setup
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Post SAT checks – Part 2
UTC/SCOOT
• Additional work will be required
to set up Instation
• OTU and comms link will need
setting up and testing
• SCOOT will require separate
visits for validation after SAT
• Sites may need secondary
linking method e.g. cableless
linking (CLF) before
UTC/SCOOT operational
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SAT Documentation
• Checklist of tests to be undertaken
• Earth Loop Impedance (ELI) certificate
• Detector loop test results
• Cable test results
• Interim or Final Takeover certificate
• Agreed list of defects (snagging list)
• Equipment inventory
• As built details
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Equipment
inventory
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Stage 3 Road Safety Audit
• Should be carried out as soon as site in operation
• Safety audit team will assess safety of completed site in
daylight and night time conditions
• Recommendation may be made for remedial actions including
signals operation
• Stage 4 RSA may be required after 12 months operation
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What Next?
• Cup of tea anyone???????
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