IRC 102-1988 outlines detailed procedures for performing traffic analyses essential for planning town bypasses. It covers techniques such as origin-destination surveys, travel time and delay assessments, and economic evaluations to understand the effects of through traffic on urban congestion. This code is vital for engineers and planners aiming to design effective bypass solutions that enhance traffic circulation around urban areas.
Overview
IRC 102-1988 outlines detailed procedures for performing traffic analyses essential for planning town bypasses. It covers techniques such as origin-destination surveys, travel time and delay assessments, and economic evaluations to understand the effects of through traffic on urban congestion. This code is vital for engineers and planners aiming to design effective bypass solutions that enhance traffic circulation around urban areas.
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Frequently Asked
IRC 102 suggests a combination of methods for origin and destination (O-D) surveys: (1) Traffic Counts (Form 1), involving manual or automated vehicle tallying at strategic locations to ascertain trip volumes; (2) Roadside Interviews (Form 2), where travelers are questioned about trip origins, destinations, purposes, and modes; and (3) Travel Time and Delay Studies (Form 3), which measure travel durations and delays on specific routes to infer traffic patterns. These methods together provide a comprehensive dataset for O-D analysis.
According to IRC 102, traffic is classified into four categories: Local traffic without through traffic, which remains within the local boundary; Local traffic combined with through traffic, where local and passing vehicles coexist; Through traffic with some local traffic, predominantly passing vehicles with some local trips; and Through traffic without any local origin or destination, representing pure pass-through vehicles. This classification aids in traffic management and road design by clarifying the nature of traffic flows.
IRC 102 employs several techniques to quantify travel time and delays: The Test Vehicle Method involves a vehicle recording start and end times of trips and noting delay occurrences; Speed Regulation Methods observe or control the test vehicle's speed to simulate traffic conditions; calculation of delays is performed by subtracting free-flow travel time from observed travel time. Data are then organized using prescribed formats such as Form 8 to support analytical assessment of congestion.
The standard calculates economic losses by first determining the additional manhours lost and extra fuel consumed due to traffic delays, comparing observed values with estimated values assuming free-flow conditions. Monetary values are then assigned by multiplying lost manhours by wage rates and fuel consumption by fuel cost per litre. These calculations are performed for both the base year and projected future years using traffic growth data, enabling a comprehensive economic impact assessment.
When selecting sites for survey stations under IRC 102, factors include positioning stations away from the carriageway to prevent disruption, ensuring adequate traffic control measures such as police assistance, providing clear signage to inform road users about the survey, situating stations strategically at intersections along the town's cordon line, and including locations near railway crossings if applicable. These measures help ensure accurate data collection to evaluate bypass requirements effectively.
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