Mitigation accident prone location on the BRT Trans Jateng Semarang District (Case Study: Soekarno Hatta Street KM 24+600 - KM 33+000)

The Route of Trans Jateng Bus Rapid Transit (BRT) Semarang Regency is one of the danger locations with 22 accidents involved BRT Trans Jateng in the period January-December 2018. This paper is to describe the results of road safety in quantitatively and qualitatively based on the results of safety deficiency measures on the road to become an evaluation model for road auditors. Data and information are compiled for analysing visual observations and measurement results of road infrastructure safety deficiencies on Soekarno Hatta Street KM 24+600-33+000. The results of the safetyness on this streets are shows there are 8 segments included the Dangerous category (B). The results of the categorization are arranged by risk management and anticipation of hazards in every segment in the form of travel safety map and safety handbook where location at risk of an accident is equipped with a QR Code that is connected to Google Maps.


Introduction
The Important transportation issues that are related to public transportation are become a very important things for the life of a city. Bus Rapid Transit (BRT) is one of type in public transportation that are not only provides you a much faster operation's speed and enhances greater services but also offering you a safe governance. Apart from this, the implementation of the Transjateng BRT poses a number of challenges. The year of accident reports at the Mulia Orda Serasi Transportation in 2018 stated that there were 22 accidents involved the BRT Trans Jateng on Jalan Soekarno Hatta.with 22 situations in 15 accidents happened because of crashing into another vehicles above, 7 accidents occured because of crashing into public facilities and the risk of another accidents.
Potential accidents can be minimized by applying a Safety Management System. According to Permenhub No. 85 of 2018 regarding the Public Transportation Company Safety Management System states that what is meant by the public transportation company safety management system is the safety management in the field of public transportation which is carried out comprehensively and in a coordinated manner in order to realize the administration of safe public transportation and manage the risk of accidents.
In an effort to prevent a risk, one of important aspect is route management. In this aspect, the identification of hazards on each route is carried out, and then the results of the identification are informed to related parties, especially the driver. The management of this route is expected to be able to minimaze the risks and potential hazard during the trip. Anticipation of hazard and risk management is very important for vehicle users to improve travel's safety and one of the bases for making safety guidelines for Trans Java Central BRT drivers. Guidelines as a reference for BRT Transjateng drivers

The Survey of Volume Traffic
The data collection was collected to determine the level of traffic density based on classified traffic volume that includes the type of vehicle and the vehicle direction, by making observations and enumeration directly in both directions

The Audit Survey of Road Safety
Road Safety Audit are focused on parameters that are used as a basis for calculating deficiencies for road infrastructure that are geometric conditions and road equipment.

The Spotspeeds Survey
The survey was conducted manually using a stopwatch to calculate travel time at a predetermined distance with a length of 50 m.

The Moving Car Observer of Survey
This method is focussed to collect the data that includes the time of travel traffic in the same direction and in the opposite direction to the vehicle 10 times back and forth

Road Inventory Survey Road
Inventory of road equipment is carried out to determine the completeness, condition and placement of suitable road equipment on Jalan Soekarno Hatta. the Target of data is traffic signs, road markings, street of lighting equipment, and supporting facilities for road traffic on the road and across the road.

The division of Road Segments
The division is intended as the first step in data analysis. Segmentation of the Wujil to Bawen road is based on the geometrical characteristics of the road, traffic characteristics and the road environment.

Analysis of Accident Prone Locations
After being divided every 1 kilometer, a traffic accident prone location is determined by the Accident Equivalent Number (AEK) method. This method is one of the methods for calculating accident rates by weighting the accident equivalent numbers referring to the cost of traffic accidents.

85th Percentage Speed
The Calculation of the 85th percentile speed method (P85) is used to present the speed according to the conditions on the ground with 85% of vehicles using speeds below the speed point graph (P85), and 15% of vehicles are above the speed point (P85).

Research value and risk categories
The results of the calculation of every aspect of road geometry and road equipment will be assessed for risk value and calculated on average every one kilometer in each segment. The results will be categorized as risk values in each segment as stated in Mulyono (20 09b; 2009c) In this study, the categories obtained from these methods are not used to determine the level of importance were used but it used as a reference to arrange risk management for drivers on the journey that will be traversed so that it can be estimated to produce risks that can be minimized.

Result and Discussions
The results of the study were obtained in 4 steps, namely division of road segments, consideration of risk points, categorization of risk in road segments and risk management of road segments with the following explanation are:

The division of road segments
The division are the first step in data analysis. The division of segments on road sections based on the characteristics of the road geometry, traffic characteristics and road environment the Roads with geometric characteristics of road, traffic characteristics and relatively similar to road environment will be divided into the same road segment because it will be determine the results of the analysis of each of the road segments. The results of the division on the road segments obtained the results of the Soekarno Hatta road segment divided into 7 road segments, namely the Wujil segment (STA 24 + 600 -25 + 200), Karangjati (STA 25 + 200 -27 + 000), Bergas Kidul (STA 27 + 000 -28 +000), Jatijajar (STA 28 + 000 -29 + 000), Randugunting (STA 29 + 000 -30 + 000), Harjosari (STA 30 + 000 -32 + 000), Bawen (STA 32 + 000 -33 + 000 )

The Identification of Problem
The problem identification is works by analyzing accident locations and carrying out an inventory of road equipment from real conditions and conditions must be. the results of tracing accident-prone locations in 2014-2018 was used the Accident Equivalence Rate (AEK) method, the following results were obtained  From the analysis of report,it was found that the data's accidents in 2014-2018 STA with 3 blacksite namely STA 24 + 600 -25 + 200 (Wujil) with an EAN value of 247 292, STA 29 + 000 -30 +000 (Randugunting) with EAN value and STA 31 + 000 -32 + 0000 (Harjosari) with EAN value of 247. Furthermore, an audit of the condition and availability of road equipment is needed to identify potential dangers from road equipment. The availability of road equipment will be a warning for drivers to get an attention to the arrangements indicated by the road equipment with the following result:

Figure 1. The Recapitulation of Road Equipment Deficiency
From these results it can be identified that the most risk points are caused by the unavailability of street lighting along this path. This is very dangerous, especially at night.   Figure 3. the Visualization of Risk Categories for Each Segmentation

The Risk Segment of Road Segmentation
From the results of risk categorization, a risk management was formed to provide the knowledge about the anticipation that must be done by motor vehicle drivers in each risk with the following layout in Appendix B.
The risk management design that will be applied on Transjateng BRT Semarang Regency on the Soekarno Hatta Road (STA 24 + 600 -33 + 000) was made to improve the safetyness on the way by informing the driver about the potential hazards that will be faced during the trip and solution to minimize the consequences which is arise from the hazards. The guidebook contains a travel points are using a national road kilometers that are expected so that the driver can easily recognized the danger risk points and estimated travel minutes from the first segment, Bawen. In the next column is a description of the potential hazards that will be faced by the driver. In addition there are images of recommendations for handling and barcode location of Google Maps for road segments.