When driving can no longer distract myself from anger, what else can I do to calm myself down?

bumped into a "friend" about few weeks ago and I decided to call up this "friend":

me: Hello Friend, this is Laura! It was great seeing you the other day

Friend: Hey Laura, me too! Is this your new number?

 
In fact, my number has been the same for more than 10 years, my friend! I guess I need to learn where to draw the line......