When turning a corner, you should activate your turn signal feet from the corner to give the car behind you enough time to recognize your intentions?

When turnig a corner, you should actiivate your turn signal 100 FEET from the corner
The 100 feet allowance will give the other drivers who are behind you enough time to realize that you want to turn, so that they can slow down and reduce their speed. This is necessary in order to avoid accident. 

Alkaline earth metals are found in group 2 of the periodic table.