Brussels, Belgium Nov 5, 2014
ROADSENSE SUMMARY Prevention of Involuntary Lane Departures by Road Audiotactile Alert Lines 1. Project Features 2. Lane Departures Mechanism 3. FR Road Experiments Speaker: Jeanne FORET, AXIMUM
1. ROADSENSE Project Prevention of Involuntary Lane Departures by Innovative Rumble Strips Companies, laboratories, road authorities Scientific, 3 years, completed end 2013
Project Stages 1. State of the Art of Rumbles and ADAS, Analysis of Lane Departure Mechanisms 2. Acoustic and Physical design of Rumble Strips for Different Users/Vehicles 3. Development of a Driving Simulator & XP 4. XP Validations on Test Track 5. Tools, Methods & XP on Roads
Existing Rumble Strips/stripes Combined with edge/center lines or not Include Audiotactile RM and milled/rolled RS
2. Lane Departures Mechanisms (SVRORs Selection)
1. Lane departure crashes addressed by rumble strips 1- Interurban crashes 2- Involuntary lane departures Consequently excluded: Initial manoeuvers: overtaking or lane shift Crashes in road junctions 3- Crashes with lane departure transversely to the road, single vehicle, without loss of control in the initial situation Consequently excluded: Dynamic loss of control in the initial situation (speed, mechanical failure, driver failure) longitudinal transversal in interaction with another (other) vehicle(s)
1. Lane departure crashes addressed by RATAL Crashes with lane departure transversely to the road, Single Vehicle, without loss of control in the initial situation Single Vehicle Run Off Road to the right Head on crashes: Run Off Road to the left, direct or after a ROR to the right (mobile object) (fixed object) Single Vehicle Run Off Road to the right and ROR to the left (rollover)
3. Rumble Strips Road Experimentations
3. FR Road Experimentations Partnership with local road authorities - Identification of road managers needs - Selection of the most acoustical rumbles - Use of the upstream results (track and driving simulator) Possibilité et faisabilité Rumble Authority Type of road Horizontal alignment strips Type CG31 2 lane road Curve (left outer, right inner) Double Center lines Rolled rumbles CG31 2 lane road Straight alignment CG76 2 lane road Straight alignment Edge lines Edge lines & shoulders Rolled rumbles Milled rumbles + Lane Stretching
3. FR Road Experimentations Matrix of Main Expected Impacts Topic Impact Indicator Road Safety Road Safety Road Safety Road Safety Decrease in Killed & Injury crashes Decrease in the Crashes Severity Change in the Vehicles Trajectory Decrease in lane departures (intrusions out of the driving lane) KI Crashes before/after KSI Crashes before/after Speed Lateral Position before/after Number of Intrusions before/after Road Safety Risk of Inappropriate Maneuver Actions on the Vehicle - Trajectories Acceptability For the Different Types of Users (motorist, truck drivers, PTW, cyclists) Surveys Acceptability For the Road Managers Surveys Interviews
3. FR Experimentation CG31 Context 1999: 60% of road fatalities vs. fixed lateral obstacles (60 of 100) 2001-2006: campaign of lateral obstacles (trees) shielding with the installation of safety barriers Budget 18 M over 6 years 2012: 33% of road fatalities vs. fixed lateral obstacles, very diffuse distribution (13 of 40) Crashes analysis Run Off Road. without known cause Single Vehicle By day and by night No more black spot
3. FR experimentation CG31 Rural Road RD632 AADT 1200 veh./day (10 % heavy goods trucks) Speed limitation: 90 kph 2 lane road, transverse profile 6,50m to 7,00 m Unpaved grassed shoulder + drainage ditches Trees planted in lines on the roadsides Broken edge line 2005-2007: no injury crash 2008-2010: 6 crashes : 5 fatalities 7 serious injuries, 2 slight injuries
3. FR experimentation CG31 Rural Road RD632 Treatment of 2 sections Section 1. straight alignment Installation of edge line rumble strips Section 2. horizontal curve Installation of double centerline rumbles Choice of rolled rumble strips Reversible Based on road marking materials
3. FR experimentation CG31 Entry of Curve Straight Alignment
3. FR experimentation CG31
3. FR experimentation CG31 Straight alignment, CG31 Position latérale des VL libres 100,0 90,0 80,0 70,0 VL Avant VL Après (arbres) VL Après (sans arbres) Proportions 60,0 50,0 40,0 30,0 20,0 10,0 0,0 Marquage Rive A droite Centré A gauche Marquage Axe Débord Axe Lane departure to the right is a rare event. No intrusion in the shoulder Most of passenger cars drive on the left of their lane. Slight move to the center of the lane after installation No inappropriate maneuver observed Number of cars: 634 336 after before,
3. FR experimentation CG31 Left Curve CG31 100,0 Position latérale des VL libres 90,0 80,0 VL Avant VL Après 70,0 Proportions 60,0 50,0 40,0 30,0 20,0 10,0 0,0 Marquage Rive A droite Centré A gauche Marquage Axe Débord Axe Car before : 90 occurrences Cars after : 203 occurrences No intrusion in the shoulder Frequent lane departure to the left Most of passenger cars drive on the left of the lane Strong shift to the right of trajectories No inappropriate maneuver observed
3. FR experimentation CG76 Rural 2 lane road RD6014 Starting situation Road markings: center line + edge lines Driving lane 3,5m wide No paved shoulder, no rumble strips Treatment Removal of existing edge lines Reduction of existing driving lanes from 3,5m to 3,0m (new edge lines) creation of 0,5m paved shoulder for free Installation of milled rumble stripes (edge and shoulder)
3. FR experimentation CG76 Straight Alignement CG76: Departure to the Right Before installation: - No car intrusion on the edge line: 0 to 2% (each direction) - More Frequent Intrusions for trucks: 8 to 30% (each direction) After installation: - No car intrusion VL - Very strong decrease for Trucks Position de la roue droite (Paris --> Rouen) Position de la roue droite (Rouen --> Paris) 70 35 60 50 PL Avant PL Après 30 25 PL Avant PL Après Proportion 40 30 20 10 0 Touche le marquage >10 cm >20 cm >30 cm >35cm Pro p o rtio n 20 15 10 5 0 Touche le marquage >10 cm >20 cm >30 cm >35cm
3. FR experimentation CG76 Straight Alignement CG76: Departure to the Left Before installation: - No car intrusion on the center line - No or Few Intrusions for trucks: 0 to 2% After installation: - No change * Car intrusion VL 0 to 1% * Trucks : 1 to 2% A narrowed transverse profile does not increase the number of intrusions in the opposite driving lane
3. FR experimentation CG76 Straight Alignment CG76: Combined Effect of Driving Lane Stretching and Rumbles on Separation between Traffic Flows AVG Lateral Distance Between Flows (cm) Car / Car: 3 500 occurrences Car / Truck : 155 occurrences Truck / Truck : 7 occurrences Car / Car Car / Truck Truck / Truck Before 181 162 130 After 151 134 125 - Crossing Cars 30cm closer (still good) - Crossing Trucks Maintain Space: Collaborative Driving
ROADSENSE Prevention of Involuntary Lane Departures by Road Audiotactile Alert Lines Contact : Pierre ANELLI AXIMUM anelli@aximum.fr
Brussels, Belgium Nov 5, 2014