However , the number of on-road crashes for 14 and 15 - year - olds increase somewhat .
On - footpath crashes peak at age 13 and drop off for 14 - year - olds .
The number of on-road crashes for 14 and 15 - year - olds increase somewhat .
On - footpath crashes peak at age 13 and drop off for 14 - year - olds .