My speedometer is broken

I just installed new tires and my speedometer must be reading low.

I was blinded by the sun's glare in my speedo glass

I didn't see the speed sign

My throttle stuck open

I just found out my 'significant other' was cheating on me

I just got fired from my job

My speedometer read <insert speed limit here> + 3 mph, officer.

Speed limit? What speed limit?

(For married folks only) My wife is going to get pregnant tonight and I want to be there