411A is correct. The speeding ticket is an "infraction." Technically, in most states you could have been arrested at the time and taken before a magistrate because you are not a resident. Once you "fail to appear", a bench warrant for "failure to appear" is issued, which is a misdemeanor, and you are now arrestable.
So, what could happen to you? If you are stopped again by the police in Florida, or otherwise have contact with the Police in Florida, and they check your name for warrants, you will be arrested and taken to jail. You can post bail and be released, otherwise you stay in jail and are arraigned before a magistrate, usually within 24 hours.
Your "failure to appear" traffic related Bench Warrant is not extaditable, so it should not be entered into the national computers; i.e. you should not have any problems entering the U.S.
You will have a problem in Florida if you have contact with the police.
You do have the option of contacting the traffic court and paying the fine by mail.
Check 6
Retired from the job
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Kick the tires, light the fires, first off is lead, brief on guard.