Motorized Level of Service Classification for Urban Uncontrolled Intersections
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Motorized Level of Service Classification for Urban Uncontrolled Intersections Suprabeet Datta 1
&
Siddhartha Rokade 1 & Sarvesh P. S. Rajput 1
Received: 14 May 2020 / Revised: 8 October 2020 / Accepted: 30 October 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Service and total delay are considered for classifying MLOS and intersections, respectively. GPS is used to collect travel time and speed data for turning movements that are transformed into average delay values. Thirteen junctions from eight different cities in India form the dataset. Divisive followed by agglomerative clustering (DAC-HAC) algorithm is applied as a two-step process for obtaining the service and total delay ranges. Validation of clusters is performed based on the Davies-Bouldin score, CalinskiHarabasz index, and Silhouette gaps. Based on DAC-HAC, uncontrolled intersections are classified into six categories (Cat-I, II, III, IV, V, and VI). Results indicate MLOS classes “D”, “E” and “F” have significantly higher service delay ranges as compared to Highway capacity manual “control” delay ranges indicating mixed traffic conditions. Most of the uncontrolled intersections under mixed traffic fall under Cat-IV, V, and VI, having higher total delay ranges (> 60 s/ vehicle/ approach). Finally, validation of the clustering results is done for geometric and roadside environmental features. Keywords Classification . Clustering . Hierarchical . Intersections . Motorized level of service . Uncontrolled
1 Introduction Control delay is the most dominant parameter under the offpeak period or exceptional cases. Control delay, according to TRB [1] is “the time lost due to occurrence of any traffic regulatory device deeming to be the prime service measure for signalized and unsignalized intersection LOS assessment.” In the case of uncontrolled intersections, “control” concept transforms to “service delay” (a subset of total delay) which is “the time lost due to constant acceleration or deceleration of motorized users at intersection influence area before completing their manoeuvre” [2]. Average service delay (a subset of total delay) at uncontrolled intersections, on the other hand, is the “total time lost due to waiting, engine-start up, acceleration and deceleration of motorized users before completing their manoeuvre at or near the intersection influence area” [3]. TRB * Suprabeet Datta [email protected] Siddhartha Rokade [email protected] Sarvesh P. S. Rajput [email protected] 1
Department of Civil Engineering, MANIT, Bhopal, India
[1, 4] states to use control delay coupled with volume to capacity ratio for unsignalized intersection LOS assessment for motorized drivers for which TRB has given six levels (A, B, C, D, E, and F). CRRI [5] and Indian Roads Congress [6] recommends volume to capacity ratio and “reserve capacity” as the only “service measures” for six categories (A to F) of MLOS classifications. None of those mentioned above guidelines gives any clue about the types or categories of uncontrol
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