1. Lec 25: Ch2.(T&LD): Site planning
Understand the difference between the “linear” site planning process and systems approach
Know what may be involved in reviewing a proposed land development
Understand the the scale of development requires different levels of traffic analysis and facility design
Understand we need to have a conceptual plan (or a preliminary plan) in order to identify alternatives and associated problems before we get involved in detailed planning and design

2. Pitfalls of “linear” site-design process
Possible problems of the linear process:
Inadequate access capacity
On-site congestions
Congestion on the public street system
High accident experience
Limited flexibility to adjust the design or operation to changed conditions
Building location & design
On-site parking & circulation
Access location & design
Access design is like an “after thought”
No feedback

3. Benefits of the systems approach
Lots of feedback opportunities
Involve the traffic engineer from the beginning!
Before building location and design are finalized and financial commitments are made, estimate potential traffic impacts on the site and the off-site, affected areas and identify possible solutions.

4. Proposed Development Review (PDR) Process
Consisting of:
Financial feasibility study  Determine the market area of influence, the projected build-out/lease-out period, and the potential short- and long-term return on investment.
Site-plan review: Site design, access location and design, and other elements
See page 19 for check items
Traffic impact analysis (TIA)  a specialized study of the impact a certain type and size of development will have on the surrounding transportation system. The first two items define the scale of TIA required

5. T I A
TIA  Concerned with the generation, distribution, and assignment of traffic to and from a proposed development through the road network surrounding the development. Also TIA is to determine what impact the existing and projected traffic on the roadway system will have on the proposed development.
When is it required?
All development which can be expected to generate more traffic than some specified threshold
All applications for rezoning
Any change in the use of an existing commercial or industrial site
The previous TIA is more than 2 years old or where increased land use intensity will result in an increase in traffic generation by more than 15% or a directional distribution in the site traffic by more than 20%

6. Typical content of a TIA
Existing conditions
Trip generation and design hour volumes
Trip distribution and traffic assignment
Existing and projected traffic volumes
Capacity analysis
Traffic accidents
Traffic improvements
Conclusions
Summary of findings and recommendations
Sound familiar…
Topics of CEEn 562

7. Planning scales: Corridor, project, or site planning issues
(Compare the size of impacted area)
Corridor Level Arterials and collectors placement & Impact of the development on these facilities

8. Planning scales: Corridor, project, or site planning issues (cont)
Site level parking, building footprint, site circulation
(See Tab 2-1)
Project level Impacts on adjacent properties and roadways and the placement of access

9. Conceptual site plan: An example
Objective: Identify suitable areas for various developments
Major land use planning determinants
Existing transp. network

10. Conceptual site plan: An example (cont)
Site characteristics of 6 sub areas, used to determine a preliminary distribution of land use