1 Søren Underlien Jensen Accident models ++ for choice of type and design of roads - Motorway network (phase 1) - Other road segments in rural areas (phase 2) - Intersections and roundabouts in rural areas (phase 3)
2 Purpose The purpose of the project is to set up: Accident models for well-specified road segments and intersections; e.g. a 4-lane motorway segment with hard shoulders, without street lighting, without sharp curves, with 130 km/h speed limit, and so on. Accident Modification Factors (AMF) that can be used to calculate what happens if the well-specified road segment or intersection has a slightly different design; e.g. if the 4-lane motorway segment does not have hard shoulders or has a 110 km/h speed limit. Calculation tools that are spreadsheets, which can estimate the number of accidents and injuries of many types/designs of roads/intersections based on the above mentioned accident models and AMFs.
3 Practical use The accident models, AMFs and calculation tools may be used in the following processes: Planning of new roads and intersections: To explore and estimate safety impacts of alternatives. Reconstructing existing roads and intersections: To identify safety measures and/or estimate safety impacts of specified changes to existing design. Elaborating design recommendations: To estimate safety impacts in absolute terms (not just percentages) of design choices that may be used in cost-benefitanalyses (CBA) or multi-criteria-analysis (MCA) in order to make recommendations.
4 The basics
5 Work process: 1) Defining and splitting the motorway network into segments on the basis of geometry, markings and signage includes recording the design (completed) 2) AADT and accidents on defined network (completed) 3) Defining and splitting the motorway network on the basis of homogeneous units in terms of accident occurrence (completed) 4) Setting up accident models (not started) 5) Setting up AMFs (started, not completed) 6) Setting up calculation tools (not started)
6 Defining the motorway network (example): Entrance-ramp Motorway Entrance-merge Motorway Motorway Exit-weaving Motorway Exit-ramp Yield line
7 Type Sub-type Number of elements Length (meters) Shortest Average Longest Total Motorway Ordinary (2-5 lanes) 1, ,612 17,332 1,971,315 Lane reduction ,922 Lane increase Total 1, ,596 17,332 1,973,817 Weaving/merge (ghost island + auxiliary + taper) Exit ,740 Entrance , ,284 Successive (entrance-exit) ,945 14,215 Motorway diverge ,440 10,654 Motorway merge ,378 14,557 Total 1, , ,450 Ramp Exit ,036 Entrance , ,753 Direct connector ,507 Parallel lane ,036 Successive (entrance-exit) ,966 Ramp diverge ,870 Ramp merge ,441 Total 1, , ,609 Service area Service station, rest area, etc ,111 40,822 Bus stop Total ,111 41,453 Dual-way (two-lane road) ,269 Total 3, ,332 2,676,598
8 Type AADT 2012 Accidents Number Lowest Average Highest Accidents Injuries Motorway 1,237 2,753 18,177 57,187 24,416 6,825 Weaving/merge 1,125 3,340 20,319 58,272 5,858 1,360 Ramp 1, ,275 22,576 1, Service area , Dual-way ,968 9,
11 Service area (not bus stop) AMF -???: Accidents per 100 meters ,9 79,9 78,4 13,8 14,6 12,4 16,1 2,5 72,7 74,6 11,1 14,6 Motorway before Exit merge Motorway between Service area Entrance merge Motorway after All accidents Injury accidents
12 Some accident modification factors (AMFs) (preliminary): Type Description AMF Accidents Injuries Motorway From 2 to 3 traffic lanes Motorway Anti-dazzle screens in median Motorway Add hard shoulder Motorway Add street lighting Weaving/merge Increase of entrance taper by 30 m Weaving/merge Increase of exit taper by 30 m Ramp Diamond to cloverleaf Ramp Short diamond to long diamond Ramp Exit downhill to exit uphill
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