Curb Zone: The curb zone is the first 0.15 m (6 in) of the sidewalk corridor, located adjacent to the roadway. It is an integral part of the road/drainage. system and keeps excess water off the sidewalk corridor.
The average age for the beginning stages of puberty is 10.5 years in girls and 11.5 years in boys. The average length of time it takes for sexual changes to be complete is about 4 years. Pubertal changes occur because of the influence of hormones.
The development of pubic hair is also observed during SMR stage 2. Testicularenlargement starts between 9.5 and 13.5 years of age in most males (SMR 2 to 3), concludingbetween the ages of 12.7 and 17 (SMR stage 5).