Lec 8, Ch4, pp.99-115:Volume Studies Know the definitions of typical volume study terms Know typical volume count methods (through reading) Be able to.

Slides:

Advertisements

Similar presentations

Lec 10, Ch.4, pp : Parking studies (objectives)

Advertisements

IRR Inventory Training TRAFFIC COUNTING. OUTLINE Introduction Types of Traffic Counts Definitions Why Count Traffic? Where to Count When to Count How.

Chapter 131 Chapter 13: Fundamental Concepts for Uninterrupted Flow Facilities Explain why capacity is the heart of transportation issues. Define capacity.

Capacity, Level of Service, Intersection Design (1)

Transportation Engineering

INTRODUCTION TO TRANSPORT Lecture 3 Introduction to Transport Lecture 4: Traffic Signal.

Case Study 4 New York State Alternate Route 7. Key Issues to Explore: Capacity of the mainline sections of NYS-7 Adequacy of the weaving sections Performance.

1Chapter 9-4e Chapter 9. Volume Studies & Characteristics Understand that measured volumes may not be true demands if not careful in data collection and.

Traffic Engineering Studies (Volume Studies)

CEE 320 Fall 2008 Course Logistics HW3 and HW4 returned Midterms returned Wednesday HW5 assigned today, due next Monday Project 1 due Friday.

Chapter 5: Traffic Stream Characteristics

Lec 28: Ch3.(T&LD): Traffic Analysis – Traffic assignment Learn how to assign generated and distributed trips to the street system approaching the site.

Lec 15, Ch.8, pp : Signal Timing (Objective)

Lec 9, Ch4, pp : Travel time and delay studies

Chapter 3. Highway Design for Performance

Highway Capacity Software (HCS) – Part II

Lec 28, Ch.20, pp : Flexible pavement design, ESAL (Objectives)

Traffic Studies TS4273 TRAFFIC ENGINEERING. Reasons To Collect Data 1.Managing the physical system (replaced, repaired, anticipated schedule) 2.Investigating.

Lec 32, Ch5, pp : Highway Safety Improvement Program (objectives) Learn the components of FHWA’s Highway Safety Improvement Program Know typical.

IRR Inventory Training TRAFFIC COUNTING. Introduction What are your needs?

Lec 5: Capacity and LOS (Ch. 2, p.74-88)

Norman W. Garrick Travel Flow Data Some Basic Concepts Good travel flow data for all modes of travel is important for transportation planning and design.

Lec 7, Ch4, pp83-99: Spot Speed Studies (Objectives)

Lec 14, Ch.8, pp : Intersection control and warrants (objectives) Know the purpose of traffic control Know what MUTCD is and what’s in it Know what.

Design Speed and Design Traffic Concepts

Level of Service Section 4.5. Level of Service: The Basics MMeasure performance by density. RRatio of operating capacity to speed. UUnits: passenger.

CE 578 Highway Traffic Operations Introduction to Freeway Facilities Analysis.

Use of Truck GPS Data for Travel Model Improvements Talking Freight Seminar April 21, 2010.

Source: NHI course on Travel Demand Forecasting (152054A) Session 10 Traffic (Trip) Assignment Trip Generation Trip Distribution Transit Estimation & Mode.

Traffic Volume Data Collection Daniel Jenkins, PE Substitute – Steven Jessberger Office of Highway Policy Information October 23, 2012.

Interpreting Demand and Capacity for Street and Highway Design Lecture 5.1 CE Norman Garrick Norman W. Garrick.

Lec 17, Ch.9, pp : Capacity of freeway sections (objectives) Understand capacity and level of service are the heart of transportation analyses Understand.

Simpson County Travel Demand Model Mobility Analysis November 7, 2003.

Transportation Engineering

How to Put “Best Practice” into Traffic Assignment Practice Ken Cervenka Federal Transit Administration TRB National Transportation.

ECGD 4121 – Transportation Engineering I Lecture 7 Faculty of Applied Engineering and Urban Planning Civil Engineering Department 1 st Semester 2009/2010.

Lec-8 Traffic Volume Counts and Road Accidents

Interpreting Demand and Capacity for Street and Highway Design Lecture 6 CE 5720 Norman Garrick Norman W. Garrick.

Chapter 5: Traffic Stream Characteristics

Part 2 Processes and approaches associated with the FHWA method 1 1 HPMS Vehicle Summary Data.

Freeways and Multilane Highways CTC-340. HMWK Ch 13 Read Section 13.7 Ch 13 # 2, 3 Ch 14# 1, 4, 5, 6, 8.

1 Part 4 HPMS Vehicle Summary Data Computation. Additional Columns 2  Ucode=if(urban_code=99999, “Rural”, “Urban”)  VMT=(end_point-begin_point)*AADT.

CE 341 Transportation Planning

1 Tobit Analysis of Vehicle Accident Rates on Interstate Highways Panagiotis Ch. Anastasopoulos, Andrew Tarko, and Fred Mannering.

Traffic Flow and Capacity for Street and Highway Design Lecture 5.1 CE Norman Garrick Norman W. Garrick.

Design Criteria CTC 440. Objectives Know what “design criteria” means Determine design criteria for various types of facilities.

Jack is currently performing travel demand model forecasting for Florida’s Turnpike. Specifically he works on toll road project forecasting to produce.

Hcm 2010: BASIC CONCEPTS praveen edara, ph.d., p.e., PTOE

Travel Data Users Forum: How Will the Changing Cost of Energy Affect Personal Travel View from a Traffic Data Perspective 87th Annual Meeting January 13-17,

HPMS Traffic Data Review Highway Information Seminar Oct , 2012 Patrick Zhang, P.E Office of Highway Information Policy, FHWA 1.

Best Practices for Collecting Counts and Risk Evaluation for Bicyclists and Pedestrians Krista Nordback, P.E., Ph.D., PSU Taylor Phillips, PSU Mike Sellinger,

Chapter 9 Capacity and Level of Service for Highway Segments

Estimating Travel Patterns on I ‐ 95 with Automated Technology NCAMPO Conference - Asheville, NC May 3, 2012 Taruna Tayal (M/A/B) Brian Wert (M/A/B) Bill.

Geometric Design: General Concept CE331 Transportation Engineering.

High way and Transportation I(DIS) ECIV 4333  Instructor : Dr. Essam Almasri  Assistants : Eng.Mustafa abou foul.

Chapter 2 1 Chapter 2. Traffic Flow: Theory and Analysis 1.Design and conduct activities to measure traffic stream characteristics 2.Analyze field data.

LOW COST SAFETY IMPROVEMENTS Practitioner Workshop The Tools – Identification of High Crash Locations – Session #2.

Traffic System Management for “Tulkarem”

High way and Transportation 2(Lab) LCIV 3034

Traffic Estimation with Space-Based Data

Chapter 1 Traffic Flow What you will be learning from this chapter …

Macroscopic Flow Characteristics

Source: NHI course on Travel Demand Forecasting, Ch. 8 (152054A)

Geometric Design: General Concept CE331 Transportation Engineering.

Design Criteria CTC 440.

School of Civil Engineering

School of Civil Engineering

Prepared By: John Sampson

Highway Engineering CE 431

Improving Transportation Inventories Summary of February 14th Webinar

Presentation transcript:

Lec 8, Ch4, pp :Volume Studies Know the definitions of typical volume study terms Know typical volume count methods (through reading) Be able to state the purpose and methods of typical volume counts Know how to present volume count data (through reading) Know how to determine the number of count stations Know how to adjust periodic counts

What we cover in class today… Terminology Types of volume counts Determination of number of count stations Adjustment of period counts

Terminology  Traffic volume studies are conducted to collect data on the number of vehicles and/or pedestrians that pass a point on a highway facility during a specified time period.  Average Annual Daily Traffic (AADT): the average of 24- hour counts collected every day in the year.  Average Daily Traffic (ADT): the average of 24-hour counts collected over a number of days greater than 1 but less than a year.  Peak Hour Volume (PHV): the maximum number of vehicles that pass a point on a highway during a period of 60 consecutive minutes.

Terminology (cont)  Vehicle Classification (VC): Records volume with respect to the types of vehicles.  Vehicle Miles (Kilometers) of Travel (VMT, VKT): A measure of travel along a section of road. A product of roadway in miles to which the volume is applicable.  Hourly Flow Rate: An hourly volume expanded from a counter taken in a period shorter than 60 minutes. The typical one is Peak hourly flow rate which is 4 times the peak 15- minute count. V peak = 4*V peak 15-min

Volume count by microwave sensors RTMS Box Multiple-lane sensing by one microwave sensor Firing example

Types of volume counts Cordon countsWhen vehicle accumulation pattern within an area is needed Screen line counts When changes in traffic flow from one area to another need to be evaluated Intersection counts When turning movements are needed Pedestrian volume counts When pedestrian demand needs to be evaluated Periodic volume counts When traffic volume characteristics are needed: Continuous, control, and coverage counts

Determination of number of count stations Common precision level for volume counts: 95-5, which means 95% confidence level and the precision level (tolerance) expressed as 5% of the estimated mean volume. Where, n = minimum number of count locations required t = value of the student’s t distribution with (1 -  /2) confidence level (N – 1) degree of freedom (Review Example 4.4)

Adjustment of periodic counts Hourly expansion factors (HEFs) Daily expansion factors (DEFs) Monthly expansion factors (MEFs) HEF = (total volume for 24-hr period)/(volume for particular hour) DEF = (average total volume for week)/(avg. volume for particular day) MEF = AADT/(ADT for particular month) (Review Example 4-5)

Finding truck adjustment factors This adjustment is needed when we make volume counts by checking the number of axles TypeNo. of AxlesNo. of vehicles No. of axles Passenger cars Trucks Total Truck adjustment factor = 13890/5740 =2.42 axles/vehicle Manual count result (for obtaining the truck factor value for the site under study)