Necessity of utilization of traffic lights instead of GUN SOUND as Athletic matches stating Alert Sign

Dear Sirs/Madams
As you are aware most of athletic matches and some other matches like swimming start by GUN Sound. The distances between Referee and athletes differ somehow.
Nowadays 1/100 th of second and even smaller time is vital in results .So with Considering the sound speed which is about 340 m/sec any 3.5 m distance between 2 athletes causes about 1/100 th sec. of hearing time difference of GUN SOUND. Sometimes the hearing GUN sound time for athlete in first lane and last lane differs about 5/100 sec or more and this is not fair.
Using of visual signs like colored Traffic lights in front of athletes as a starting alert sign would solve this important problem.
It is notifiable that we may send GUN SOUND as starting alert sign to blind Athletes through loud speaker for every individual athlete to make a fair starting condition for them.