The Mexican Gene

I believe in genes. I believe that Mexicans have one, as of yet unidentified gene, a gene that restricts them from using signals when they drive.
This makes driving here in Vallarta adventurous at times and dangerous as well.
When one is driving it is imperative to watch out for the car ahead as the driver may at any time decide to take a turn without signaling, trusting that other drivers are alert.
He -- or frightening more often she--will suddenly brake and take a turn. Right ones are the easy ones, the left turns command that the car comes to a full stop to check for oncoming traffic before the driver puts the foot on the gas and swerves to the left.
Now this is mostly a problem here where I live, because due to the beach on the one side and the mountains on the other, we are stuck with a two lane road and not much chance for expansion.
So here you have the full delight of the Mexican gene, for miles and miles and miles.
One day they will find it and we will all take a deep breath and say
there you are
and then go on being careful, because discovering the gene does not mean they can change it.