Transportation Plan preparation

Presented by :

1. Damani Mital

What actually CORRIDOR is ??? And Where it is come in Face?? Corridor:

A Corridor is a set of essentially parallel & competing facilities & modes with cross – connectors that serve trips between two designated points. It may contain rural highway ,urban street ,pedestrian ,etc.

Corridor Traffic forecasting

Corridor Traffic Study

Count

Segment

Point

o Segment: Segments are stretches of a facility in which the traffic demand and capacity conditions are relatively constant.

o Point: Points are locations at the beginning and end of each segment, at which traffic enters, leaves, or crosses the facility.

o Freeway: A freeway is defined as a divided highway with full control of access and having two uninterrupted flow or more lanes for the exclusive use of traffic in each direction. All the access is through a ramp a separate entrance or exit way to or from the Freeway.

o Segment Capacity :

Capacity is the maximum hourly flow rate, at which persons or vehicles reasonably can be expected to traverse a point or a uniform section, of a lane or roadway during a given time period, under prevailing roadway, traffic and control conditions. But sometimes the demand may exceed the capacity during peak hours, which will bring Queue delay. Thus demand adjustment is required and is done as follows: Adjusting for excess demand from the capacity is necessary only if working with forecasted or estimated demands rather than counted traffic. If the demand exceeds the capacity at any point in time or space, then the excess demand must be stored on the segment and carried over to the following hour. The downstream demands are reduced by the amount of excess demand stored on the segment. The algorithm starts with the entry gate segments on the periphery of the corridor and works inward until all segment demands have been checked against their capacity.

o Corridor Identification Steps:

Step One: Data Collection & Review --

1. Collect and review various background information.

2. Review existing plans and recommendations for the study area.

Step Two: Identify Issues & Planning Concepts --

3. Identify planning process issues.

4. Visualize issues and identify alternative concepts.

5. Review and discuss background information, issues and concepts with community.

o Corridor Identification steps..

Step Three: Develop & Choose Alternatives --

6. Identify land use alternatives.

7. Present & review land use alternatives with community.

8. Evaluate alternatives.

9. Choose recommended alternative.

Step Four: Create Plan --

10. Identify implementation priorities.

11. Review draft plan, recommended alternative, and implementation with community.

12. Draft & adopt plan.

o Corridor Analysis :

Corridor analysis is the method of combining point , segment & Facility analysis to estimate the overall performance of multimodal corridor. Mostly the performance measure of any corridor are determined by calculating its capacity ,the travel & queue delay in the given section. Since this tool is required for multi facility & multimodal transportation system mostly it covers highway subsystem ( freeways,rural highways & urban streets) & transit.

o Queue Delay :

The queuing delay only the amount due to demand exceeding capacity is computed for all segments. The queuing delay is computed for each direction of each segment and time period only when demand is greater than Capacity.

o Free flow Travel time:

The segment free-flow traversal times are obtained by dividing the length of the segment by the estimated free-flow speed (FFS).

Cordon Line Survey

Objective

To understand the present internal-external travel patterns (Origin - Destination matrix) The survey supplements the Home Visit Survey.

Methodology

Traffic Count Survey

Interview Survey (Roads, Railway, Airport)

o Screen Line Survey :

o Objective

The estimated OD matrix from PT Survey will be verified by comparing estimated demand on the selected links in the traffic simulation with the counted traffic volume on the screen line

o Methodology

Traffic Count (Hourly traffic volume by vehicle type by direction, 24 hours and 16 hours)

o Screen Line Analysis :

o Screen line analysis compare the results of trip assignment with the traffic counts on roads. More precisely, it is a process of comparing the directional sum of ground count traffic volumes across a screen line or a cordon line with the directional sum of the assigned traffic volumes across the same screen line or corridor line.

o Screen line analysis is a useful tool for the calibration of trip assignment models, & it can also be used for more general purpose of calculating flows that cross a screen line .

o Conclusion :

o Delay due to traffic congestion accounts 28.9% (PHD/PHT) of the total number of travel.

o No any over saturation (i.e., no Queue delay). So that the sub system is good.

o Though many vehicles are passing without stopping there is operational failure (there are few vehicles passing the section with stopping).

Thank you !!!

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