If the court dismissed the case brought against you with prejudice, the dismissal means that the speeding charge was dropped and the case was closed, and the "with prejudice" means that the case cannot be brought again. Congratulations.
I agree with the assessments of my colleague, this means that the case is dismissed. Congrats on the dispo! Good luck.
DISCLAIMER I do not practice law in your State. This answer is provided solely for informational purposes only. This answer does not constitute legal advice, create an attorney-client relationship, or constitute attorney advertising.