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International audience; This paper highlights potential impact points of a child pedestrian during a crash with a front end of a vehicle. Child anthropometry is defined for ages between 3 and 15 years. It is based on the measurement of 7 different segment body heights (knee, femur, pelvis, shoulder, neck, chin, vertex) performed on about 2000 French children. For each dimension, the 5th, 50th and 95th percentile values are reported and the corresponding linear regression lines are given. Then, these heights are confronted with three different vehicle shapes corresponding to a passenger car, a sport utility vehicle and a light truck in order to identify impact points. In particular, it is shown that the thigh is directly hit by the bumper for children above 12 years old whereas head impacts principally the hood. Influences of the child anthropometry on the pedestrian trajectory and comparison with tests procedure in regulation are also discussed. child, anthropometry, pedestrian, vehicle shape, accident

In the field of numerical crash simulations in road safety research, there is a need to accurately define the initial conditions of a frontal impact for the car occupant. In particular, human models used to simulate such impacts barely take into account muscular contracting effects. This study aims to quantify drivers'behaviour in terms of posture and muscular activity just before a frontal impact. Experiments on volunteers were performed in order to define these conditions, both on a driving simulator and on a real moving car. Brake pedal loads, lower limbs kinematics and muscle activation were recorded. Coupling instantaneous data from both experimental protocols (simulator versus Real car), a standard emergency braking configuration could be defined as (1) joint flexion angles of 96◦, 56◦ and 13◦ for the right hip, knee and ankle respectively; (2) a maximum brake pedal load of 780 N; (3) a muscular activation of 55% for the anterior thigh, 26% for the posterior thigh, 18% for the anterior leg and 43% for the posterior leg. The first application of this research is the implementation of muscle tone in human models designed to evaluate new safety systems. Driving behaviour, Driving simulator, Electromyography, Motor vehicle crashes, Emergency braking