At the intersection or interception of two or more streets, no hedge, fence or wall higher than two feet above curb level, nor any obstruction to vision, between the height of two to 10 feet above the curb level other than a post or a tree, shall be permitted within the triangular area formed by the intersecting street lines and straight line joining the street lines at points which are 25 feet distant from the point of intersection measured along the street line or such distance as recommended by the Township Engineer to insure traffic safety.