Abscission

sycamore leaf frost
A plant will abscise a part either to discard a member that is no longer necessary, such as a leaf during autumn, or a flower following fertilisation, or for the purposes of reproduction. Most deciduous plants drop their leaves by abscission before winter, whereas evergreen plants continuously abscise their leaves. Another form of abscission is fruit drop, when a plant abscises fruit while still immature, in order to conserve resources needed to bring the remaining fruit to maturity. If a leaf is damaged, a plant may also abscise it to conserve water or photosynthetic efficiency, depending on the ‘costs’ to the plant as a whole. The abscission layer is a greenish-grayish color.–Wikipedia

Odocoileus virginianus

4 lane 35mph
A pedestrian has a 3.5% chance of being killed by a vehicle traveling at fifteen miles per hour, but the likelihood of death increases to 37% when the vehicle is traveling at thirty-one miles per hour and to 83% when the vehicle is traveling at forty-four miles per hour.–Why Pedestrian-Friendly Street Design is Not Negligent Michael Lewyn