Analysis of Relationship between Geometric and Potential Accident on Imogiri - Dlingo Road, Bantul, Indonesia
DOI: 10.14710/mkts.v29i2.57168
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Summary
This study evaluates the relationship between road geometric design and accident potential on the Imogiri-Dlingo road section in Bantul, Indonesia. The research was motivated by the road’s hazardous characteristics—hilly terrain, sharp turns, and long ascents/descents—and a severe accident in February 2022 that resulted in 13 deaths and 33 injuries. The primary objective was to assess whether the horizontal and vertical alignments of this primary collector road comply with the Indonesian Road Geometric Design Guidelines (Pedoman Bina Marga No. 13/P/BM/2021). The methodology involved collecting secondary data on accidents (2018–2020), traffic volume, and digital elevation models, alongside primary data from a Road Safety Inspection (IKJ). The existing road geometry was modeled using AutoCAD Civil 3D software. The analysis focused on specific geometric attributes: horizontal alignment parameters (minimum radius, curve length, and bend angle) and vertical alignment parameters (slope, critical length, and vertical curve design control value K). These modeled attributes were compared against the standards set for a primary collector road with a design speed of 50 km/h. The results indicated that while lane count, lane width, and shoulder width complied with regulations, the alignment geometry significantly failed to meet safety standards. Specifically, 87% of bend radii, 67% of horizontal curve lengths, and 58% of bend angles did not fulfill requirements. For vertical alignment, 43% of slopes, 57% of critical lengths, and 67% of vertical curve design control values (K) were non-compliant. Traffic data revealed that motorcycle traffic dominated the road, comprising 93% of volume in 2019 and 70% in 2020. Accident records from 2018–2020 showed 24 moderate and 5 severe accidents, with single-vehicle accidents (41%) and head-on collisions (21%) being the most frequent types. The study concludes that the Imogiri-Dlingo road is dangerous and prone to fatal accidents due to non-compliant geometric design. The high rate of single-vehicle accidents is attributed to steep and long vertical alignments that exceed critical length limits, causing vehicles to lose control. Head-on collisions are linked to insufficient horizontal curve radii and lengths, which restrict sight distance. The authors recommend installing speed limit signs, surveillance cameras, escape lanes, guardrails, and warning signs, as well as prohibiting large buses and trucks from using the route to mitigate accident frequency and severity.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-06-20 |
| archive | success | canonical_url | — | — | 1 | 2026-06-26 |
| extract | success | cached | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-21 |
| chunk | success | chunk | — | — | 1 | 2026-06-21 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-21 |
| promote | success | — | — | — | 1 | 2026-06-20 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-25 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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