It depends on whether the ticket is considered a criminal or civil matter in the US.

For a criminal case, yes, they need to prove "beyond a reasonable doubt" - which would require that you are positively identified as the driver.

For a civil case, they only need to prove by a "preponderance of the evidence" - which is a much lower standard.

This is why tickets from red-light cameras in many states are zero-point citations. You're still charged a fine, but there's no finding of guilt attached to the offense, which keeps it away from being considered a criminal matter. (This is the same way parking tickets work.)