To determine the presence of resessive alleles. :]
crossing
Britian
The purpose of a railroad crossing sign, is to let you know that there is a railroad coming up or that there is one right in front of you.
Definitely.
To try & reduce the number of grade crossing accidents.
Check point Charlie was the most famous crossing point in Berlin.
you can check youtube
Check the link below.
Each state
The purpose of a stoplight is to ensure that cars are stopping safely and not running through the light. It also protects the safety of pedestrians that may be crossing at the crosswalk.
No... It's a virtual game Like another life... LOL :)