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Speed-securing measures on rural roads in Sweden: An observational study.
Carl Johnsson1, Aliaksei Laureshyn1, Carmelo D'Agostino1
1Department of Technology and Society, Lund University, Lund, Sweden.
Traffic Injury Prevention
|September 20, 2024
Summary
Road infrastructure radius moderately correlates with driver speed on rural roads. However, many locations fail to keep speeds below limits, indicating a need for further research into effective speed-reduction strategies.
Area of Science:
- Road safety engineering
- Traffic psychology
- Transportation planning
Background:
- Speed-securing measures aim to maintain safe road user speeds.
- Evaluating the effectiveness of these measures on rural roads is crucial.
Purpose of the Study:
- To assess the efficacy of existing speed-securing measures on Swedish rural roads.
- To determine how well these measures limit vehicle speeds.
Main Methods:
- Drone footage analyzed 34 rural road locations with speed limits from 40-70 km/h.
- Investigated the relationship between road and vehicle trajectory radii and driver speed choices, including the 85th percentile speed.
Main Results:
- A moderate correlation was found between road/vehicle radii and driver speed.
- A weak correlation existed between driven radius and road radius.
- Only 17 out of 34 locations successfully kept 85th percentile speeds below the posted limit.
Conclusions:
- Road infrastructure radius is a significant factor in reducing speeds.
- The inconsistent relationship between driven and road radii highlights the need for further research to optimize speed-limiting designs.
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