Transportation System Analysis at the Major Road Intersection in the CBD Area of Rangpur City, Bangladesh

Traffic and transportation management is a major challenge for a city in Bangladesh. Moreover, this challenge is so critical to managing of traffic and transport at a Central Business Area (CBD) in a city like Rangpur. The main objectives of this study are to find out the present problems of traffic and transportation and discussion on way of an effective solution. So, the angle of different intersections, flow analysis of roads, level of service (LOS) analysis of selective roads and physical feature analysis at the CBD area is conducted for this study. To find out the condition of traffic and transportation at CBD area different type of survey have been done like traffic volume survey, physical feature survey, delay time survey, parking survey. Collected data analyzed by using MS Excel software and design or pictorial data analyzed by using GIS software, Google Sketch-up software. The main problems at the CBD area are informal occupancy, violet setback rules, no minimum sight distance for a vehicle, lack of proper use of footpath, inappropriate channelization of vehicles.


Introduction
Bangladesh is a rapid move to an industrial country, city streets do not reach to function at its satisfactory level. Different classes of vehicles such as cars, vans, buses, tracks, auto-rickshaw, motorcycles, by-cycles, bullock carts, etc. are found to use the common roadway facilities without segregation on most of the roads in developing countries like Bangladesh [11]. A better transportation circulation system is very much important for every nation and its rapid demand of economic, industrial, trade etc. The efficiency of an urban transport system is greatly influenced by its circulation management system, Circulation management is very important for efficient functioning of road transport [1]. The urban transportation problem is actually a complex bundle of interrelated problems [2]. They can be grouped into three categories: congestion, mobility, and ancillary impacts. Traffic congestion, delays, noisy and unpleasant traffic way, anxiety for road accident, inaccessible and unpleasant pedestrian ways, these are common problems for every street [3]. The city corporation is located in the north-western part of Bangladesh. The present area is 203.19 Sq.Km and population are about 10 Lac [4]. Effective traffic and transportation management system are required at CBD area in Rangpur city. To increase the capacity and to ensure condition for smooth traffic movement immediate attention is required for the streets. The study will out the existing deficiencies of the traffic management system. Important Intersections at CBD Area a) Jahj Company Intersection b) Payirachottor Intersection c) Supermarket Intersection d) Townhall Intersection

Literature Review
Identified some congestion points and also discuss the causes of traffic congestion in Dhaka city. This study also finds out the problems of different intersection point like road and rail line. This study introduces authors experience and tries to the solution of the present traffic problems. The study also finds out the violet of traffic and transportation laws in Dhaka city. On the basis of geometric methods and ways are trying to solution of present horrible traffic and transportation situation in Dhaka city. On the basis of this study, a new data is found out that rickshaw is not the major causes of traffic jam in Dhaka city [5]. In Dhaka, the traffic congestion cost is US$3 billion a year and the city losses over 8 million work hours daily [10]. Traffic control point and locate some traffic congestion point in Khulna city at CBD area. To control this situation provide some policies and guidelines. This study provides some idea about intersection management. This report mainly shows discuss the general causes and solution to traffic congestion of congesting points. It also provides some traffic related problem solution for selective intersection in Khulna city [6]. Parking and their types are different in various conditions. It is also helpful for parking survey. The modeling process, transport design, and survey procedure are clearly described this book. Detail design and methods are the main focus of this book [7].

Material and Method
A physical feature survey is conducted at the CBD area for find out the density of market area beside the main road at CBD area in Rangpur city. On the basis of Highway Capacity Manual (HCM) traffic flow is analyzed the roadways. Level of Service of delay time survey is an important indicator to understand the nature of traffic flow on the road. Delay time survey is conducted on different roads on the basis of the respective intersection. A vehicle is going throughout each intersection at a time both directions. One kilometer distance of the roadway is considered from each intersection point. Than Measure the angle between roads at an intersection on the basis of American Association of State Highway and Transportation Official.

Physical Feature Survey
On the basis of physical feature survey market and important building, density is shown on the map. Mainly three factors are considered for preparation of the map. These are: (a) Building or market situated beside the major road or not. (b) Parking space is available or not (c) Building must be used only commercial activities In the density map, dark color shows the highest density of market. The yellow color is shown the densely market area of CBD. Light green color is show some marketplace besides the road which is not filling up above three factors. The blue color is shown the normal density of market at the CBD area.

Standard Angle Analysis at Intersections in CBD Area
The minimum angle of an intersection should not be less than 65⁰ [8]. For the functional intersection, the angle range must be within 80⁰ to 120⁰ [8].
(1) Angle between the Roads of Jahaj Company Intersection The angle between Station road and G.L. Roy road (Shapla chottor to G.L. Roy road direction) is 75⁰ which are 5⁰ less than the standard. Another angle between Station road and G.L. Roy road (City bazar to G.L. Roy road direction) is 140⁰ which is 20⁰ excess than the standard angle. The Los delay time survey is C. Angle between Station road and Dwanbari road (Shaplachottor to Dwanbari road direction) is 108⁰ and LOS of delay time survey at 9-10am, 2-3pm, 4-5pmof the Dwanbari road is C. Again angle between Station road and Dwanbari road (Dwanbari Road to Station Road towards city bazar) is 52⁰ this angle is 25⁰below the standard.  (2) Angle between the Roads of Supermarket Intersection The angle between Station road and Central road (towards supermarket) is 155⁰ this is 45⁰ excess and the LOS of the delay time survey at 9-10am is C. Moreover there is no footpath and informal occupancy occurred in Supermarket road. Huge parking occurs for Guidry Bazar, Supermarket, and Mini supermarket. There are no minimum 18 ft sight distance in front of the supermarket. (

3) Angle between the Roads of Payirachottor Intersection
The angle between Station Road and the Central road is 161⁰ it is 41⁰ excess. Supermarket Los at 9-10am, 2-3pm, 4-5pm is C. Again Station road to City Bazar road angle is 157⁰ which is 37⁰ excess in respect of standard. (1) Angle between the roads of Town Hall Intersection The minimum angle of a functional intersection range must be within 80⁰ to 120⁰ according to standard. So this intersection is perfect for vehicle movement. (2) Angle between Roads of Jummapara Intersection The angle between Jummapara roads and City Bazar road 131⁰ which is 11⁰ excess from the standard. On the other hand, City Bazar road to Jummapara road angle is 56⁰ it is 24⁰ less than the standard. Also, Supermarket road to Station road angle is 152⁰ which is 32⁰ excess from the standard angle. Jummapara road to Station road is 8⁰ less from the standard.

Delay Time Survey at Different Intersection
Delay time of a vehicle is called as the difference in travel time between when a vehicle is unaffected or affected by the different interruption in the road.
(1) Delay Time at Jahaj Company Intersection This is the busiest intersection in the CBD area in Rangpur city. This intersection is jointed southern part and eastern part of the city to the rest of the city. Total travel time of the intersection is 22 minutes. (2) Delay Time at Payira chottor Intersection Total three roads intersect at the payira intersection. Travel time is gradually increased from morning to noon of the day. More or less 24 Munities is spending for passing this intersection. (3) Delay Time at Supermarket Intersection Two roads intersect at Supermarket intersection one is Station road and another is Supermarket road. Travel time is gradually increased from morning to noon of the day. More or less 21 Munities is spending for passing this intersection.  The LoS of different intersections at CBD in Rangpur city is calculated by using the standard. Area of Rangpur City, Bangladesh Source: Authors' Compilation Based on [9] According to the Highway capacity Manual, the traffic flow of different intersection at the CBD area is given below.  [9] Overall condition of the traffic flow is not good enough in the CBD area. The condition of the entire road is just below the danger level. It also indicates the alarm of huge congestion next few years.

Proposed Vehicle Movement Route at CBD Area in Rangpur City
(1) New Route for Vehicle Movement A new one-way circulation route should have fixed. The auto and rickshaw shall move from G.L. Roy road to Townhall intersection by using Dewanbari road.
(2) Remove Temporary auto Stand on Existing Route Temporary auto stand in front of the Supermarket must have restricted as well as in front of Payirachottor intersection and Jahaj Company intersection.

Proposal for Major Intersections at CBD Area
Intersections of CBD area are the key area for traffic and transportation management of CBD in Rangpur city. If all the intersections are appropriately working than the whole CBD is worked appropriately.
(1) Jahaj Company Intersection This intersection is one of the major intersections of the CBD area. The entire commercial and business center is situated here so some initiative should introduce here for effective traffic and transportation management.
It is very clear that some illegal structure is created the traffic problem and obviously, standard side distance must be introduced as well as the standard angle between two roads must be followed. (2) Supermarket Intersection The supermarket is one of the busiest places. Moreover, Gudribazar is situated here which is a largest wholesale market in the town. There is no footpath in front of Gudribazar. So some initiatives are: (a) On Street Parking A parking lot should perfectly introduce in front of the supermarket. Angular parking is appropriate for supermarket area. (

b) New Footpath
There is no footpath in front of Gudribazar. So a footpath should construct beside the supermarket road.