Traffic and Parking GenerationThe impact on development

AITPM National Conference 2014Paul Morris

Development Assessment

• Parking Demands• Off-street supply• On-Street impacts• Shared/Compatible Uses• Multiple-use discounts

• Development Plan• Specific rates• Generic definitions

• Empirical Data• SA Guides• RTA Guide• SA Surveys• GTA Database

Development Assessment

• Traffic generation• Internal operation• Access• External impacts

• Development Plans• Objectives• Principles

• Empirical Data• RTA Guide• SA Surveys• GTA Database

Access – a matter of degrees

• Linked to traffic generation• Appropriate Access?

• Unsignalised or signalised• Restricted turning movements• Use of existing local streets• Left turn auxiliary lanes

• Warrants• Left turn lanes

Access – a matter of degrees

• Austroads Guides

Determining the Need for Auxiliary LanesThe need for deceleration turn lanes cannot be stated definitively in all instances because of the many factors to be considered, such as speeds, traffic volumes, capacity, type of road, service provided, traffic control and crash history.

Guide to Road Design – Part 4A: Unsignalised and Signalised Intersections

Access – a matter of degrees

Figure 4.9: Warrants for turn treatments on the major road at unsignalised intersections

Access – a matter of degrees

• External Infrastructure Costs• Short Taper - $30K• Standard Deceleration Lane - $150K• Extra costs for land acquisition, services, design, etc

• Developments are marginal• Use appropriate analysis• Justify needs not just broad warrant

Parking – The BIG Issue

• Parking Demands• Off-street supply• On-Street impacts• Shared/Compatible Uses• Multiple-use discounts

• Development Plan

Parking – Development Plan Rates

Campbell-town

Marion Playford Port Adelaide Enfield

West Torrens Onkaparinga Charles Sturt Walkerville3

3.5

4

4.5

5

5.5

6

6.5

7

Shop

5.5

7.0

Parking Demands

• Impacts on Parking Rates• Extended Shopping Hours• Changes in Shopping Trends (On-line, Entertainment)• Increased Retail Floor Space• Multiple Use Discounts

Parking5.2

4.8

5.15.

2

4.6

5.1

Spaces per 100 square metres Gross Leasable Floor Space

Parking

3.8

3.0

3.8

3.6

3.6

3.1

5.2

4.8

5.15.

2

4.6

5.1

Spaces per 100 square metres Gross Leasable Floor Space

They should

build more parking.....

.

Only 3.9 per 100sqm...WOW

Hmmm... 130 spaces

OMG...$650K to build

RUK.... $3.7m..!!

WOW....85 spaces available

$2.5m

Conclusions

• Development Plans• Review parking rates• Lower shopping centre rates

• Traffic Warrants• Review the use of warrants• Consider the actual need from analysis

• Consider the cost• Impact on feasibility

Thank You