Performance Analysis of Batik Solo Trans Corridor-6 Services †

: The development of public transport in Surakarta City can be seen from the existence of Batik Solo Trans Corridor-6. This route passes through several types of land uses so that the passengers are very diverse. This article is focused on analyzing the user characteristics and their assessment of the service performance and operations. The data required consist of: bus arrival/departure time, number of passengers getting on/off, distance between stops, number of passengers


Introduction
Transportation is the process of physically moving people/goods from one place to another, either using or without transport mode [1].The development of transportation has made it easier for human mobility for various reasons including social economic activities [2,3].This development is influenced by several factors such as environmental, historical, technological, and political economic factors, and society's demands for global transportation [4][5][6].Massive developments and with changing times have made means of transportation increasingly modern and sophisticated, one of which is public transportation [7].
Based on Law No. 22 of 2009 [8], public motorized vehicles are defined as any vehicle used to transport goods and people for a fee.Its existence needs to be implemented in order to provide good and appropriate transportation services for the community [9].Public transportation is one of the factors that plays an important role in the movement of traffic flows in a place and the social and economic development of a region [10].One of the regions in Indonesia that has rapid economic growth is Surakarta.In 2022, this city recorded economic growth of 6.25%, which was higher than the Indonesian average of 5.31% [11].
Surakarta/Solo is the most populous city in Central Java.This is proven by the population of 522,728 people in 2021 within an area of 46 km 2 .Population density in this city reaches 11,363.65 people/km 2 , compared to a density of 4431.92 people/km 2 in Semarang [12,13].This development cannot be understood separately from the support of the transportation sector which facilitates connections between regions.This city is among those developing integrated public transportation, namely the BST route with Balapan Station and Adisumarmo Airport.It is hoped that the procurement of BST can improve the quality of services to the people in this city [14].
The performance of a transportation system can be considered from many perspectives, including those of engineers, economists, managers, planners, and definitely from those of travelers or users [15].Regarding public transportation, the differences in perception are grouped into three, i.e., users, operators, and government [16].The performance in question is the ability of public transportation to operate or serve users.Minimum service standards on routes constitute the requirements for the implementation of public transportation regarding the type and quality of service received by each user of transportation services [17].The optimal service is generally the hope desired by the community.Some of the desired performance parameters are comfort, security, and speed [18].
PT. Batik Solo Trans is the party responsible for BST Bus operations.Bus Friends is an online application from the Ministry of Transportation which was launched in June 2020.This application, TEMAN BUS, was created to provide economical, easy, reliable, and comfortable transportation for the Indonesian people [19,20].Currently, PT BST operates six main corridors with a fleet of buses.Based on observations of land use around Corridor-6 in the form of hospitals, schools, markets, universities, hotels, and so on, the number of passengers is varied [7].Based on the description above, this research needs to be carried out to identify user characteristics and their assessment of the corridor's service performance, as well as its operational performance.It is hoped that this research can be used as material for consideration by related agencies and as reference material for similar research.

Research Methods
The object of this research is the bus of Batik Solo Trans Corridor-6 in Surakarta City, which has a capacity of 20 seats.Currently, the fare applied to the general public is IDR 3700, while for students and people with disabilities, the fare is IDR 2000.This corridor starts from Tirtonadi Bus Station and goes to Solo-Baru, the route of which can be seen in Figure 1.The primary data obtained comprise the vehicle user and operational characteristics, as well as answers to questions regarding the transportation service.The questionnaire used to search for respondent assessment data was previously tested for validity and reliability, the results of which can be seen in Table 1.Data obtained from other related agencies are: the average number of passengers per day and the monthly occupancy rate from the Surakarta City Transportation Service and PT.Bengawan Solo Trans, Surakarta, Indonesia.Performance analysis is based on Minister of Transportation Decree SK.687 [22], Minister of Transportation Regulation PM 10 [23], and the World Bank [24].Data collection was carried out offline on the bus with the respondents being passengers in the corridor.The characteristics of the respondents reviewed were: age, gender, occupation, origin and destination of passengers, number of mode changes, and modes used before and after.
Based on Table 1, it can be seen that all calculated r-calculated values are greater than r-table.This shows that all question items are valid and can be used as research instruments.The results of the reliability test for the variables used have a Cronbach's Alpha value of 0.841 or greater than 0.6, so they are said to be reliable to use.

Operational Performance
The operational performance parameters of public transport used consist of load factor, headway, speed, travel time, and delay.Load factor (LF) is a comparison between the number of passengers and the number of available seats expressed in percentage.The standardized value to obtain balanced operational conditions is 70%.
Headway (H) is the time interval between two consecutive buses which is usually determined at terminal gates and bus stops.The standard value is 5-10 min for ideal conditions and 2-3 min for peak hours.This value can be calculated from the difference between the arrival times of the second fleet (T 2 ) and the first (T 1 ), as shown in Equation (1).
Speed is the rate of movement of a vehicle expressed in kilometers per hour.The standard value during peak hours is 30 km/h, while the standard value during off-peak hours is 60 km/h.Travel time (TT) is the time required for each transport fleet to complete the journey from the terminal of origin to the destination with an average value of 1-1.5 h and a maximum of 2-3 h.Stopping time (ST) is the time for which the bus stops at each shelter or bus stop.The standard value is 45 s during peak hours and 60 s at during off-peak hours.

Satisfaction Level Assessment
The level of passenger satisfaction is a measure of the satisfaction of each passenger when using public transportation.This was obtained from a direct survey of Corridor-6 BST users.The data obtained are the result of a questionnaire that was given to users.All the data are then processed by multiplying each answer weight by the predetermined points.The total respondent achievement value from the assessment results is adjusted based on the respondent achievement level (RAL) value.Adopted from Sahlan in [25], the classification of the achievement levels in this case can be seen in Table 2.

Passenger Characteristics
The characteristics of BST passengers can be identified according to the results of the completed questionnaire.The proposed criteria are gender, age, occupation, passenger's origin and destination, and the mode used before using public transport as seen in Figures 2 and 3, and Table 3.Based on Table 3 as well as Figures 2 and 3, it can be seen that the majority of respondents who use this transportation are female (61%), aged 15-25 years (44%), and are students (40%).Moreover, 78% only made one modal change, with walking and using private vehicles constituting 36% each.The majority of respondents' came from the Timuran Bus Stop (16%), and the most common destination was the Al Islam High School Bus Stop (17%).

Operational Performance
Based on the results of the performance evaluation, the values for the load factor, headway, travel time, travel speed, and stopping time are obtained.The recapitulation results can be seen in Table 4.
Based on Table 4, it can be seen that several indicators have met the standards, namely headway, travel speed, and stopping time.Indicators that do not meet the standards are the load factor and travel time.This low load factor is because many people still choose private vehicles as their main mode of travel compared to public transportation.From observations in the field, it is found that there is currently a Trans Jateng Bus which has a Solo-Sukoharjo-Wonogiri route.This bus meets with the Corridor-6 of BST at Tirtonadi Terminal and Solo Baru, so it can be an alternative mode of transportation for passengers in these two areas.This is attractive because the route is simpler than Corridor-6 which passes through the city center.

Passenger Satisfaction Level
The level of passenger satisfaction analyzed includes the physical condition of the bus and the service from the service provider.Based on the recapitulation results, the level of achievement of respondents was obtained, which can be seen in Table 5.Based on Table 5, it can be seen that the range of the respondent achievement level (RAL) values is 72.4-80%.The lowest score is related to the alertness of officers in handling problems on the bus.The highest score was obtained for the friendliness of the officers in the service.The table also shows the average RAL value, namely 76.78%, which refers to Table 2, which is included in the good category.Even though the results are good, operators and related parties are expected to continue to maintain this corridor service and listen to public complaints.

Conclusions
Based on the analysis, it can be concluded that the majority of Corridor-6 users are female (61%), aged 15-25 (44%), and are students (40%).The trip characteristics obtained were that mode changes were mostly only made once (78%), with private vehicle use or traveling on foot (36%), originating from the Timuran Bus Stop (16%) and going to the Al Islam High School (17%).The performance indicators for this mode of transportation that meet the standards are headway, travel speed, and stopping time, while those that do not meet the standards are the load factor and travel time.However, the satisfaction level value is in the range of 72.4-80%, with an average of 76.78%.Based on the results of this assessment, the service performance is categorized as good.Even though it is good, there has been a lot of criticism and suggestions from the public.Therefore, operators and related parties are expected to continue to maintain their services and improve the necessary matters according to public complaints.The factors that cause the load factor to be small is the existence of an alternative mode that can be used, i.e., Trans Jateng Solo-Sukoharjo-Wonogiri, whose route is simpler than Corridor-6, which passes through the city center.

Figure 2 .
Figure 2. Distribution of passenger origin zones.

Figure 3 .
Figure 3. Distribution of passenger destination zones.

Table 1 .
Instrument validity and reliability test results.

Table 3 .
Characteristics of passengers.