The Influences of Seating Geometry, Posture and Helmet Position on Bicycle Safety
In another field study, Working Group 1 took pictures of bicyclists in all age ranges and bicycle types, in order to evaluate posture, head position and helmet position. From these pictures, different angles were identified in order to assess helmet position and body posture while cycling. The incline of the line between the handlebars and the seat can indicate the degree to which the handlebars are raised above the seat. Combining these measurements with an approximation of the cyclist’s age provided data about posture and head positioning.
Establishment of angels relevant for seating geometry and vision limits
Of course, the type of bike had a major influence on handlebar positioning. Racing bikes often have handlebars that rest below the level of the seat, while mountain bikes and city bikes do not. Helmeted riders held their heads slightly lower than those who did not wear a helmet. The limitation of vision, mostly due to the helmets sun shade, varied from 0 degrees (horizontal line from the eye to the sun shade) to 75 degrees upwards. Age appeared to have no impact on posture or head positioning. However, older riders who wore helmets tended to wear them lower on their faces, which could possibly affect vertical vision limitations.
