Newlands Cross Upgrade EIS - European Investment Bank

South Dublin County Council Newlands Cross Grade Separation
Traffic Modelling: Working Paper No. 1
junctions and establish if more detailed modelling of certain areas will be required. The ORR
model was also used as a basis to determine if additional zone disaggregation or finer network
modelling was required.
Up-to-date signal timing information for junctions in the study area was obtained from
DTO/SDCC and other agencies. These were used to update the model.
Review of Existing Traffic Patterns
Traffic survey information was used to define the existing traffic patterns in relevant sections
of the wider and local network. Information from the DTO model, site visit observations and
traffic counts was used to determine the existing junction operation.
Traffic survey data was required for model recalibration and validation. The following
strategy was followed:
• Two sets of cordon counts (internal and external) to be used for model recalibration.
• Screenline counts for link flow validation. The screenlines run from north to south
(M50) and east to west (N7).
• Journey time surveys along the N7 and other key competing routes.
The above strategy included the following traffic count locations:
External Cordon Counts
0. N81/N82 Junction;
1. MCC at on Long Mile Road/Walkingstown Avenue (R112) junction;
2. MCC at Walkingstown Cross;
3. ATC on Whitehall Road, immediately to the north of the R112 junction;
4. ATC on Wainsfort Road, immediately north of the R112 junction;
5. MCC at R81 Templelogue Road/ R112 Templeville Road Junction;
6. ATC on Old Bridge Road, River Dodder crosssing;
7. ATC on road linking the N81 and Wellington Lane with the R114, River Dodder
crosssing;
8. ATC on M50 south of the N81 interchange, River Dodder crossing;
9. ATC on R113 Old Bawn Road at the River Dodder crossing;
10. ATC on N81 west of N82 and Saggart Road;
11. ATC on Mill Road north of Slade Road junction at Saggart;
12. ATC on N7 east of R120 junction at Citywest Golf Course;
13. ATC on R120 Peamount Road south of R134 junction at Milltown;
14. ATC on R403 Celbridge Road at Co. Kildare border;
15. ATC on M4 west of R403 Celbridge Road junction at River Liffey Crossing;
16. ATC on Leixlip Road west of M4 junction;
17. ATC on R109 Lower Lucan Road at River Liffey Crossing;
18. ATC on M50 north of junction 7 (N4 Interchange) at River Liffey Crossing;
19. ATC River Liffey Crossing at Chapelizod;
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Final 3 November 2005