2026-10-11T06:19:01Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34030440 2026-09-30T07:51:39Z category_26383 item_type_3 month_year_09_2026

Dataset for Lane-Dependent Speed Asymmetry Across Expressway Tunnel Portals: A Field-Based Transition–Recovery Analysis in Mountainous Terrain Mohd Najmi Abd Razak (25142357) Jezan Md Diah (25142286) Muhammad Akram Adnan (25142366) Civil engineering not elsewhere classified Tunnel Operating speed 85th Percentile Speed Driver Behaviour Speed Adaptation <p dir="ltr">This dataset supports the study entitled “Lane-Dependent Speed Asymmetry Across Expressway Tunnel Portals: A Field-Based Transition–Recovery Analysis in Mountainous Terrain.” The dataset contains derived field-based operating-speed observations collected at the Menora–Meru Tunnel on the North–South Expressway, Malaysia. It comprises 80 lane- and zone-specific 85th-percentile speed (V85) observations across ten five-minute observation intervals and four spatial locations: 50 m before the tunnel entrance, at the tunnel entrance, at the tunnel exit, and 50 m after the tunnel exit.</p><p dir="ltr">The dataset was prepared to support the analysis of lane-dependent operating-speed variation and transition–recovery behaviour at expressway tunnel portals. Variables include observation interval, tunnel transition zone, location, traffic lane, and V85 speed in km/h. A data dictionary and supporting metadata are included in the accompanying Excel workbook.</p><p dir="ltr">Raw individual-vehicle LIDAR records are not reconstructed in this public dataset. Traffic-volume data supplied by PLUS Malaysia Berhad are also not included because they may be subject to third-party data-sharing restrictions. The publicly shared dataset therefore contains the derived V85 observations used in the reported statistical analyses.</p> 2026-09-30T07:51:39Z Dataset Dataset 10.6084/m9.figshare.34030440.v1 https://figshare.com/articles/dataset/Dataset_for_Lane-Dependent_Speed_Asymmetry_Across_Expressway_Tunnel_Portals_A_Field-Based_Transition_Recovery_Analysis_in_Mountainous_Terrain/34030440 CC BY 4.0