Tourism Relevant Road (TRR) or simply can be called the road that connects tourism objects starting from the gate leading to the TDA or called the tourist route. Tourist paths are a number of roads in the road network system that are identified as being used by tourists to reach tourist destinations in an area. TRR can consist of various road statuses (national, provincial, district) and road functions (arterial, collector, local). TRR must be the main concern if an area will develop its tourist destination. TRR must be in a good or good level of service.
TRR service level conditions will significantly influence the number of tourist visits in a tourist destination. Good or bad service, in general, measured by the level of comfort of the driver (riding quality) when passing a road, the main indicator is the flatness of the road. The standard flatness parameter is called the International Roughness Index (IRI). One method of measuring IRI values ??commonly used in Indonesia is NAASRA roughness meter and the method of its implementation refers to SNI 03-3426-1994. IRI values ??in Indonesia are used to determine and evaluate the condition of the road surface stability. The Directorate General of Highways determines the IRI boundary value that can be used to evaluate the roughness of road infrastructure, divided into four conditions of road infrastructure roughness, namely good, moderate, lightly damaged and heavily damaged. The greater the IRI value, the lower the riding quality level will be. The road is categorized as good if the IRI value <4, the medium category if the IRI value is between 4-8, the category is lightly damaged if the IRI value is between 8-12, and if the IRI is> 12 then the road is categorized in a heavily damaged condition.
TRR with access quality that supports infrastructure in basic services, strengthens local economic relations with tourism, and attracts private investment in tourist destinations (KTA). Improved transportation infrastructure improves road safety for residents and visitors, reduces transportation time for trade and business activities, and is more environmentally friendly.
International Roughness Index (IRI)
Roads that have rough surface roughness can cause inconvenience to road users, traffic accidents, increased dynamic load on the road surface thus accelerating the process of road damage, and vehicle damage. If road surface roughness is not regularly maintained and maintained it will adversely affect road users and the road infrastructure itself. The direct impacts of poor road roughness include stressing the vehicle structure, reducing the level of comfort for road users, increasing dynamic loads on the surface of the road by vehicle wheels so as to accelerate damage to the road structure, and reducing the effectiveness of vehicle transmissions, especially those related to driving and braking action because this is closely related to the risk of accidents and increased road user fatigue. The indirect impact of poor road roughness conditions is the increase in vehicle operating costs including fuel consumption costs, tire wear costs, vehicle maintenance and repair costs, and depreciation costs. Thus, it can be said that regular road surface roughness evaluation and treatment will provide enormous benefits for road users.
Measurement of road surface roughness is needed because the imperfections in the geometry of the surface of the road infrastructure will cause vibrations on the vehicle when crossing the road. IRI is used to measure road surface roughness, the roughness measured at each location is assumed to be physical at that location. The level of IRI road flatness is one of the factors / service functions of a road pavement that greatly affects the comfort of the driver (riding quality). There are several causes of road surface unevenness, namely:
One method of measuring IRI values commonly used in Indonesia is NAASRA roughness meter and the method of its implementation refers to SNI 03-3426-1994. IRI values in Indonesia are used to determine and evaluate the condition of the road surface stability. The Directorate General of Highways determines the IRI boundary value that can be used to evaluate the roughness of road infrastructure, divided into four conditions of road infrastructure roughness, namely good, moderate, lightly damaged and heavily damaged. The smaller the IRI value, the worse or less stable the road, on the contrary the greater the IRI value, the better or more stable the road.