You're driving and you see the vehicle ahead of or next to you indicating that it would like to get into your lane. Your default response is to:
Now imagine the above situation, but you can only intuit that the vehicle would like to get in your lane, because it is not using the appropriate turn indicator. You:
You're approaching a traffic signal; the light has just turned red, and a tractor trailer or a large truck/lorry ahead of you is attempting to change lanes right in the area near the lights. You:
Which of the following is a valid reason not to use your turn signal when changing lanes or making a turn?