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Table 4 Descriptive statistics of the study database on junctions*
From: A comparative evaluation of the safety performance of bus priority route configurations
Characteristic (variable in the model) | Statistics: categories with percent distribution; mean and sd for numeric values; for accidents—frequencies per site with percent distribution |
|---|---|
Type of BPR configuration combined with bus-overtaking possibility (BPR type_Bus_over) | (1) curbside—57%; (2) open center-lane—17%; (30) barrier-separated central and no bus-overtaking—20%; (31) barrier-separated central with bus-overtaking—6% |
Type of area combined with number of lanes for general traffic and with level of pedestrian activity (avp) | (001) urban, 1 lane, high—12%; (010) urban, 2–3 lanes, low—6%; (011) urban, 2–3 lanes, high—67%; (110) suburban, 2–3 lanes, low—15% |
Year of accident occurrences (Year) | (1) 2010—23%, (2) 2011—25%, (3) 2012—26%, (4) 2013—26% |
Vehicle traffic on main road, in ten thousands | Mean 3.0, sd 1.3, min 0.4, max 5.9 |
Vehicle traffic on secondary road, in ten thousands | Mean 2.1, sd 1.7, min 0.1, max 8.5 |
Categories of vehicle traffic on main road, in ten thousands (Cat_veh_main) | (1) up to 2–22%, (2) between 2–3–26%, (3) between 3–4—29%, (4) over 4–23% |
Categories of vehicle traffic on secondary road, in ten thousands (Cat_veh_sec) | (1) up to 2–25%, (2) between 2–3–37%, (3) between 3–4–26%, (4) over 4–12% |
Bus traffic, in thousands | Mean 1.4, sd 0.6, min 0.2, max 3.9 |
Categories of bus traffic, in thousands (Cat_bus) | (1) up to 1–26%, (2) between 1–1.5–30%, (3) between 1.5–2–26%, (4) over 2–18% |
1—Total injury accidents | 0–42.2%, 1–20.2%, 2–13.5%, 3 or more—24.1% |
2—Severe accidents | 0–83.0%, 1–13.5%, 2–3.1%, 3–0.4% |
3—Pedestrian accidents | 0–74.0%, 1–16.2%, 2–7.3%, 3 or more—2.5% |
4—Bus accidents | 0–85.5%, 1–11.0%, 2–2.7%, 3 or more—0.8% |
5—Bus & pedestrian accidents | 0–91.7%, 1–6.9%, 2–1.0%, more—0.4% |