Trip Generation for Street and Highways Lecture 14 CE 4720 Norman Garrick.

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Presentation transcript:

Trip Generation for Street and Highways Lecture 14 CE 4720 Norman Garrick

Trip Generation Calculations for Street and Highway Construction

Norman W. Garrick Storrs Center

Norman W. Garrick Storrs Center Google Earth The Site

Norman W. Garrick Storrs Center Google Earth The Site Constraints Wetlands Forest Reserve

Norman W. Garrick Storrs Center Google Earth The Site Built Area

Norman W. Garrick Storrs Center

Norman W. Garrick Storrs Center Model

Norman W. Garrick Storrs Center Model Village Road

Norman W. Garrick Storrs Center Google Earth

Norman W. Garrick Storrs Center 195 Problem

Norman W. Garrick Storrs Center Importance of the Network

Norman W. Garrick Using TG Manual without Correction Estimated number of trip ends = 24,600 ITE Trip Generation Manual Proposed size of project

Norman W. Garrick Using TG Manual with Correction for Mixed Use Estimated number of trip ends = 15,900 It is very important to remember that this total includes walking, biking and transit trips Not just car trips

360 State, New Haven Trip Generation

360 State, New Haven trip Generation over predict trips The 360 State Street was estimated to produce 674 PM peak hour vehicle trips Requiring the construction of 500 parking spaces Live monitoring shows only 116 trips (17% of what was predicted) - Mixed Use Trip Generation Model (New Haven and SCRCOG)

LOS, Volume Capacity Sample Calculation A two lane urban street has an ADT of 20,000 vehicles per day. Estimate what fraction of the year this street will operate at i) LOS E, ii) LOS D. Do this calculation for directional splits of 50% and 60%. The hourly volume distribution and the design hour service volumes are given on the following sheets.

Traffic Distribution Hour volume as % of ADT Number of Hours with traffic great than shown

Design Hour Service Volume Urban Streets with Frequent Signal Controlled Intersections Source : Assumptions: > 4.5 Signalized intersection, 1.5 % heavy traffic, 12 % left turn, 12 % right turn Level of ServiceDesign Hour Service Volume A B C275 D700 E850 F>850

Ocean Springs – Biloxi Bridge

Biloxi – Gulfport Region

Ocean Springs – Biloxi Bridge Location

Ocean Springs – Biloxi Bridge ADT Pre-Construction

Design Hour Service Volume Source : AASHTO 1990 Level of ServiceControlled Access Highway Design Hour Service Volume per Lane Uncontrolled Access Highway Design Hour Service Volume per Lane A700 B1100 C D E2000 F>2000

LOS, Volume Capacity Ocean Springs – Biloxi Bridge Estimate the level of service for the Ocean Springs – Biloxi Bridge.

Ocean Springs – Biloxi Bridge ADT Pre-Construction