Effect on Characteristics Narrowing Traffic

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Published on International Journal of Engineering & Industry
Publication Date: June 10, 2019

Agus Deswantoro, Singgih Suroto, Suharianto & Gunadi Rahmanto
NSC Polytechnic, Surabaya
Unisma Polytechnic, Malang
Budi Utomo Technical College, Malang
Sakti Polytechnic, Surabaya
Indonesia

Journal Full Text PDF: Effect on Characteristics Narrowing Traffic (Case Study on City Roads Malang-Holy Road, Km. 5).

Abstract
The condition of the road narrowing can occur when entering the bridge, the occurrence of an accident, in the event of road repairs. In determining the characteristics of the traffic relationship is used three methods approaches: Greenshield linear, logarithmic Greenberg, Underwood exponentially. In normal road conditions, vehicle speed is greater than the narrow road conditions and meeting the normal way and narrowed, this was due to differences in the geometric characteristics of the road, on the condition of the road two lanes into one lane. From the analysis and calculation on the condition of the road narrows obtained regression coefficient of determination, whether the method Greenshield (R2 = 0.5519), Greenberg (R2 = 0.5415), and Underwood (R2 = 0.5504), greater than in normal road conditions (Greenshield R2 = 0405, Greenberg R2 = 0.4163, and Underwood R2 = 0.4092) or in normal road conditions and narrows meeting. (Greenshield R2 = 0.4498, R2 = 0.4999 Greenberg, and Underwood R2 = 0.4182). This means that a pair of data flows and speeds on road conditions narrows describe the condition of various densities from small to large. The density of an average room on the free flow model Greenshield and models Underwood gives almost the same results on conditions cut the same path despite the difference in the value of the maximum current densities, due to the characteristics of the location is more appropriate to use the model Greenshield and Underwood compared with the model Greenberg. On condition cut road narrows result Greenshield (Uf = 56.96 Km / h; Dj = 71.46 smp / km; Vmax = 1017.51 smp / hour / direction), Underwood (Uf = 60.58 Km / h; Dm = 50 smp / km ; Vmax = 1114.23 smp / hour / direction), while on the model Greenberg (Um = 15:39 km / h; Dj = 276.28 Smp / Km; Vmax = 1564.43 smp / hour / direction). The shock waves were obtained at Greenshield models, occurred in five periods when demand exceeds the capacity that is on the hour: 08:05 to 08:15 ( = -2.49 km / h), 08:45 to 8:50, ( = – 1:42 km / h), 10.35- 11.00 ( = -1.32 km / h), 15:20 to 15:30 ( = -2.65 km / h), 16:20 to 16:25 ( = -2.42 km / h), whereas in the case of shock waves Underwood models at the time, namely the three perode hours: 08:05 to 08:10 ( = -0.0189 km / h), 15:25 to 15:30 ( = 0.0635 km / h), 16:20 to 16:25 ( = 0.05 km / h). Long a queue at each Greenshield models occur for 13 minutes 28 seconds, 5 minutes 1 second, 26 minutes and 26 seconds, 10 minutes 29 seconds and 10 minutes 3 seconds, whereas in the old Underwood queuing models each occurring for 5 minutes 9 seconds, 5 minutes 6 seconds, 5 minutes 10 seconds.

Keywords: Flow, speed, traffic density.

1. BACKGROUD
Transport problems is a problem often faced by countries that have been developed and also by developing countries such as Indonesia, both in the field of urban transport (Urban Transportation) as well as inter-city transportation (Rural Transportation). The creation of a transportation system that ensures the movement of people, vehicles or goods is smooth, safe, fast, cheap, comfortable and appropriate to the environment has been a goal of development in the transport sector.
One of the problems that contributed to the degradation of traffic, which will be used as research material here is the problem of narrowing the roads are congested traffic flow. Narrowing is: a section of road with traffic capacity conditions thereafter (down stream) is smaller than the inlet (up stream). The road condition like this can occur for example when entering the bridge, the occurrence of an accident causing partial width of the road is closed, during roadwork or other conditions that cause changes in vehicle trips from the free flow (Uninterrupted Flow) becomes impaired (Interrupted Flow) resulting in a decrease in speed and increase in density between vehicles.

2. PURPOSE AND OBJECTIVES
Purpose of this study are: to determine how much influence on the current road narrowing, speed and traffic density at the study site.
While the purpose of this study is:
a. To determine the relationship between the flow (flow), velocity (speed) and the density (density) of traffic due to the narrowing of the road at the study site.
b. To find out the current value and the maximum density of both the normal and the road narrows at the study site.
c. To determine the value of shock wave due to the narrowing of the road at the study site.
Furthermore, the results from this study are expected to provide input for the planning and operation of traffic so it can produce proper planning, efficient, and effective. And can predict queue length calculation approach reality that there can therefore be used to overcome the bottlenecks caused by the effect of narrowing the road at the study site.
The location of this research study lies in the traffic lane between the towns of Malang-Holy, Km 5. With the terrain flat topography, the effect is relatively small side disruptions and virtually non-existent, as well as pavement conditions are relatively good, so that the effect of the traffic that occurs purely due to the narrowing of the road.
Given the limitations of time, effort, and cost, then the scope of the problem in this study is limited by:
a. The scope of this study is limited to one study location that is on the road section Malang-Holy city, 5 Km.
b. The analysis is only done on aspects of supply and demand on the road at the study site.
c. Analysis of the relationship between the flow (flow), velocity (speed) and the density (density) traffic using the model is a linear model approach Greenshields, Greenberg Logarithmic models, and models Exponential Underwood.
d. Determining the value of the shock wave is based on the determination of the model chosen approach.

3. METHODOLOGY, PREPARATION AND PROCESSING DATA
Roads, the two parts of the survey is the direction toward Malang, detailed in the data of these roads are as follows:
– Normal Condition
a. Consists of 4 lanes, 2 directions.
b. The width of each lane: 3.5 m
c. Separator directions is limited by the Median
d. The dividing lane markings in the form of a straight line to falter.
e. Good pavement conditions.
f. Shoulder of the road: 2 m (shoulder inside + outside)

– Narrows Conditions
a. Consisting of 2 lanes, 2 directions.
b. Lane width: 3,5 m.
c. Separator directions in the form of a straight line markings disjointed.
d. Pavement conditions are relatively good (slightly hollow).
e. Shoulder of the road: 1.5 m (shoulder not hardened)
Passing traffic volume recorded at four separate places, that is on the road Normal in the middle lane and the lane edge, on the road meeting between Normal and narrow streets and on the narrow road. As with the retrieval of data traffic volume, the vehicle speed data retrieval even this is carried out four separate places. Data retrieval speed on each lane are two lanes on the road normal conditions, one lane on the condition of roads meeting between Normal and narrow streets and one lane on the road conditions of narrowed. From the observation of the road which is used for research, it is known that some types of events occur the dominant side barriers along the way were observed (especially at peak hours) is the amount of non-motorized transport (bicycles) which operates and pedestrians.
From the result of recording the number of vehicles actually in the field on a piece of road narrows and the meeting between the road narrows and normal respectively for directions to Malang and directions to Holy time slice 5 menitan then the data of each vehicle are then summed and used in units of vehicles per hour. To calculate the percentage of vehicles in each direction is by summing the vehicle for two-way, then each direction can be determined percentages after each direction divided by the total in both directions and multiplied by one hundred. Furthermore, having known the total number of vehicles in both directions as a condition to obtain the conversion value will be calculated on the volume of vehicles actually in the passenger car unit (smp) by combining the survey results for each type of vehicle with unit conversion values. Because total volume usually does not exactly equal to the unit in the table, it is necessary to make adjustments to the interpolation. For example, at time slice 08:00 to 08:05 on a narrow road cut traffic volume Malang direction. Jjumlah total volume in both directions. 1584 vehicles, which are in the range between 1350 to 1900, then to determine the conversion value, eg at MHV from 1.5 to 1.3 should be held interpolation values, namely: 1,5 – {[(1584-1350) / (1900-1350)] x (1.3-1.5)} = 1.415. Based on the amount of volume per direction, then simply count the total number of vehicles only way to Malang. Then for the calculation of the volume of vehicles in the passenger car unit (smp) for normal road cut middle lane and edge both for directions to Malang, need to be interpolated conversion value equal to the calculation process narrows the road cut.
To find a space velocity of each vehicle type is obtained by the formula:
50 m / {(t1 + t2 + … + tn) / n} seconds.
Note that the figure of 50 m is the mileage of the vehicle surveyed ti is the time it takes to traverse a distance of 50 meters in a second. Given the speed calculated in units of Km / h, then the above formula should be adjusted to the existing unit in order to obtain a new formula:
{(50/1000) Km / [(t1 + t2 + … + tn) / (nx3600)]} hours.
Then to seek an average speed of space for all kinds of vehicles, obtained in the same way in the search for each type kendaraa space velocity. As for calculating the density value by dividing the volume of vehicles with an average speed of space at the corresponding time slice.
Barriers Side, Having obtained the respective types of barriers (at peak hours) then summed each type of barrier so that the frequency of occurrence of each type of side barriers. Next calculate the weighted frequency that is by multiplying the frequency of occurrence of each type of side barriers with a weighting factor of each type of side barriers, then obtained by summing the total side friction around the frequency of occurrence after being multiplied by a weighting factor. Having obtained the total side friction is then adjusted with the side barriers class. So finally obtained grade category side friction on road conditions and road narrows normal that the low side barriers class category based on value weighted occurrence frequency each worth 67 and 59.

4. ANALYSIS
The relationship between these three variables above is based on data traffic flow and speed of the vehicle is taken every period of 5 menitan arranged in pairs in a further list can be searched with a density value of the basic equation V = D. US. The relationship between speed (US), density (D) and current (V), were analyzed using three methods namely method Greenshield, Greenberg and Underwood. Statistical settlement was approached by finding the relationship between speed and density through regression method. The relationship between speed and density of each method Greenshield, Greenberg and Underwood are as follows:
a.Greenshield : US = Uf – (Uf / Dj) .D (1)
b.Greenberg : US= Um. ln (Dj/ D) (2)
c.Underwood : US= Uf. eD / Dm (3)
a. Testing Statistics
The variables tested in this study is the value of F and t is the controller of the results of statistical analyzes., In this case the linear regression, by comparing the value of the F and t obtained from the results of this calculation with the F and t from the table. The test is said to be true if the value of F and t from the calculation is greater than on the table, then the value of R2 is the coefficient of determination that indicates how much influence the independent variable (X) on the dependent variable (Y) is seen that the value of F and t for the whole world more greater than the value of the F and t daru table at 95% confidence level, so that statistically the whole model can be used.
b. Study Results Analysis
The formulation of the model of relations that have been drawn as above, it appears that for the speed-density relationship model in the model Greenberg intercept a great value because it fits the model of logarithm relationship. In the speed-density relationship Greensield models provide a certain amount of saturated density, whereas the other models have value magnitude huge density. At the speed-volume relationship model Greenberg models appear to provide the amount Vmax is high enough, or in other words a decrease in speed is not always followed by the addition of volume. This is due to the characteristics of the observed locations less suitable model Greenberg, either in traffic or geometric characteristics of the course. On condition narrow road (section B) of the regression analysis, coefficient of determination, either on methods Greensield, Greenberg, Underwood is greater than in normal road conditions (section AA) or on normal road conditions and narrowed meeting (section CC). This means that a pair of data flows and speeds on road conditions narrows (section B) further describe the condition of various densities from small to large. From the results of the F test and t, both in normal road conditions (section AA), meeting the normal path and narrowed (section CC), the road narrows (section B), to model Greenberg smaller than the models Greenshield and models Underwood, this means that the density less effect on the speed of the vehicle as well as the significance level of variance between the density and speed of the vehicle is very small. Underwood is greater than in normal road conditions (section AA) or on normal road conditions and narrowed meeting (section CC). This means that a pair of data flows and speeds on road conditions narrows (section B) further describe the condition of various densities from small to large. From the results of the F test and t, both in normal road conditions (section AA), meeting the normal path and narrowed (section CC), the road narrows (section B), to model Greenberg smaller than the models Greenshield and models Underwood, this means that the density less effect on the speed of the vehicle as well as the significance level of variance between the density and speed of the vehicle is very small. Underwood is greater than in normal road conditions (section AA) or on normal road conditions and narrowed meeting (section CC). This means that a pair of data flows and speeds on road conditions narrows (section B) further describe the condition of various densities from small to large. From the results of the F test and t, both in normal road conditions (section AA), meeting the normal path and narrowed (section CC), the road narrows (section B), to model Greenberg smaller than the models Greenshield and models Underwood, this means that the density less effect on the speed of the vehicle as well as the significance level of variance between the density and speed of the vehicle is very small. This means that a pair of data flows and speeds on road conditions narrows (section B) further describe the condition of various densities from small to large. From the results of the F test and t, both in normal road conditions (section AA), meeting the normal path and narrowed (section CC), the road narrows (section B), to model Greenberg smaller than the models Greenshield and models Underwood, this means that the density less effect on the speed of the vehicle as well as the significance level of variance between the density and speed of the vehicle is very small. This means that a pair of data flows and speeds on road conditions narrows (section B) further describe the condition of various densities from small to large. From the results of the F test and t, both in normal road conditions (section AA), meeting the normal path and narrowed (section CC), the road narrows (section B), to model Greenberg smaller than the models Greenshield and models Underwood, this means that the density less effect on the speed of the vehicle as well as the significance level of variance between the density and speed of the vehicle is very small.
c. Determine the value Flow (Volume) maximum
The maximum current value can be obtained by using a formula that has been lowered and is discussed in Chapter II previous theoretical basis, and thus the determination of the maximum flow directly used existing formula.
-Model Greeshields
vm = (4)
-Model Greenberg.
Vm = (D j. U m ) / E (5)
-Model Underwood.
Vm = (Dm. Uf ) / E (6)
-Capacity
According IHCM, computation capacity can be calculated by the formula;
C = Co x FCW x FCsp x FCsf (7)
Information :
C = Capacity (smp / hour).
Co = basic capacity.
FCW = adjustment factor due to the width of the traffic lanes.
FCsp = adjustment factor due to the separation direction.
FCsf = adjustment factor due to the side barriers
d. Determination of Selected Model.
Determination of the chosen model of shock wave calculations are based on the criteria of the test value F, T and R2 are large, in addition to visits also achieved the maximum current of each model. At Greenberg models showed the maximum current value (supply) that is greater than the current value that comes (demand) so there will be a shock wave, and has a value of F test, t and R2 smaller than the models Greenshield and Underwood. To further prove which model is the most ideal is attempted to be calculated following the two selected models are: Model Model Greenshield and Underwood. The maximum current value of the chosen model are: Model Greenshield and Underwood Model as the basis for calculation of the shock wave analysis:
a. Model Greenshield
Vm = 1017.5048 smp / hour / lane
b. Model Underwood
Vm = 1114.2333 smp / hour / lane