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20 Cards in this Set
- Front
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an evaluation of the potential effects that a particular development’s traffic will have on the transportation network in its impact area. |
Traffic Impact Assessment |
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Magnitude of studies will vary depending on (3) |
1. Type of development 2. Size or density of development 3. Location of development |
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Main Purpose of TIA |
determine the traffic generated by a development project and how the generated traffic affect the existing conditions and level of service of the transportation system in the area;
Similarly, for a MORE detailed traffic impact study, the environmental effects of the traffic generated are also analyzed
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Finally, it is proposed to alleviate the traffic impacts and thereby improve the level of serviceof the transportation system. |
Mitigating Schemes or Measures |
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Consequences on the transportation system in an area as a result of adevelopment are |
ascertained and analyzed to determine thenecessary measures inalleviating theseconsequences. |
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Types of Survey (7) |
1. Manual Classified Volume Count 2. Origin – Destination Survey 3. License Plate Survey 4. Travel time and delay Survey 5. Sea Passenger/ Cargo Transport Survey 6. Pedestrian Count 7. Boarding and Alighting Survey |
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TIA will answer the ff: |
1. Will the new project have impacts on traffic on any existing residential streets and how will those impacts be mitigated?
2. Will the new development aggravate any existing safety hazards or create new ones and, if so, how can thosehazards be corrected?
3. Can the proposed development be served by public transport?
4. Is the on-site parking sufficient or is there an opportunity to share parking with other adjacent uses?
5. How many driveways are needed, and how will these impact the external road?
6. What are the transport improvements needed to serve the traffic generated by the new development?
7. How much will the improvement cost be and who will pay for them?
8. Is the design of the development friendly towards bicyclists and pedestrians who need to access the development or who need to pass through or by the development? |
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Warrants for the conduct of TIA (3) |
• When the proposed development is expected to generate 100 new trips during the AM or PM peak • When the proposed project is expected to affect the already congested areas (causing LOS to drop to D) • Areas identified as accident black spots |
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Thresholds (ITE) |
• Residential development with 150 dwelling units • Commercial development with 1, 400 sq. m. and above • Office: 3,250 sq. m. • Industrial: 6,500 sq. m. • Educational: 2,790 sq. m. or 250 students • Lodging: 120 occupied rooms • Medical: 4,270 sq. m. |
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A TIA is typically appropriate for the following local processes (9) |
• Zoning and rezoning application • Land subdivision application • Condominium application • Environmental assessment (i.e., EIA) • Site plan approval • Special-purpose districts • Development agreements • Changes to general and / or specific plans • Annexations |
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Typical Scope of Recommendations |
The scope of recommendations for the conduct of TIA includes but is not limited to the following: • Transport improvements • Road geometry • Traffic safety • Site circulation and parking • Transport facilities related to public transport, bicycle and pedestrian travel • Travel Demand Management • Neighborhood traffic and parking management • Funding for countermeasures |
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a qualitative measure describing operational conditions within a traffic stream, and their perceptions by road users. The relationship between level of serviceand traffic characteristics is determined from degree of congestion. |
Level of Service |
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Used to illustrate on a map the flows of people or goods from point to point based on the values from a matrix. |
Trip Desire Lines |
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CAUSE OF DELAY: (7) |
• Public Utility Vehicle Loading/Unloading of Passengers • Traffic Control System • Pedestrian Crossing • Maneuvering vehicles such as parking, left turning or opposite turns • Other vehicles blocking • Road Construction/ Maintenance Works • Others |
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Software Applications |
Synchro 9 Emme 4 Strada Cube PTV Vistro PTV Visum |
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Time elements in TIA (3) |
1. Horizon years (planning period)• Refer to the anticipated completion date of the proposed development at full operation• Forecasts for 20 years 2. time periods to be analyzed• AM and PM street peak (weekday/week‐end)• AM and PM site peak (weekday/week‐end)• Noon peak (weekday/week‐end) 3. Impacts during construction and operations |
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Whose responsibility? (3) |
• 5 Actors • EIA & TIA • CLUP, CDP, Zoning Ordinance, TIA |
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Actors in TIA(5) |
• Government as regulator and evaluator • Developer as proponent • Consultant/preparer • Academia • Community |
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Developed in the era of interstate highway construction in the US from the 50s to the 90s • May be more appropriate for highways and not necessarily urban or local streets • May lean towards capacity expansion recommendations, though not intrinsically bad nor necessarily so • Innovations in determining LOS for transport that can consider overall people‐moving performance – Multi‐modal LOS • “Context‐Sensitive Solutions Guidelines for Urban Thoroughfares” of ITE • “Livable or Healthy Streets” policy in Europe • “Complete Streets” Concept |
LOS |
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Concept to create a vision for a great community and then plan streets to support that vision. |
Streets as Places |
