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FYI, in a situation where your dog is not listening and heads towards traffic, you need a "secret" word that is only used in emergency situations. It is known as a "reliable recall". We just had this conversation today, my wife and I. We had a Rottweiler a few years back and she was well versed in reliable recall. We practiced at lease once a week. Well, one day she was excited to be out of the house and heading to the nieghbors, were her friend lives. She darted out towards the street just as a car was rounding the corner. Reliabel recall, stopped her dead in her tracks and she came running. The purpose of choosing a "secret" word is to prevent the dog from hearing or getting used to a normal command, such as come, here, heal etc. It has to be a word that is easily identifiable and not really sound much like another word. Such as "umbrella" but obviously you wouldnt use that here because or all the rain here. We use Bonsai such as Bonsai tree. To train your dog, use the highest level of treats that he will do anything for. Train outside in a controlled environment. Takes two people. Have your son, daughter or wife take the dog across the yard walking away... once he gets a few feet away, yell the word loudly and get real excited start off with saying 'lets go, lets go' over and over and if needed start heading away. Get the dog excited, get him running to you. Use really good treats. Do this a couple days a week, increase the distance but always do it as a surprise. Once he/she gets it, then start doing it about once a week outdoors lets say on a normal walk off lease. Always reward with a high level treat. The secret word will eventually become a "trigger" for his attention and nothing else will matter at that point. He/she will come running every time and most importantly in an emergency! Good luck! Unless the dog has his ecollar on 24/7 this is the most reliable method of getting your dogs attention in an emergency.
Why not just teach come and demand they listen without having any secret code words? Saying a command and warning them with a vibrate or tone is like saying the same command over and over with no response. The more you do it the more you have to do it. If you teach the command properly and have an ecollar, your dog will listen on the first command. You may have to use the ecollar at first to back it up but after a while it is just a safety that you don't use. I use the vibrate feature on my Dogtra collars to turn the dog in the field while hunting. Its the same as two short toots on the whistle but I get an immediate course change. Its silent and I don't warn the birds we are around.