Was there damage ?
Did you admit to it ?
"Any employee involved in any accident shall immediately notify the Employer."
"In the event of a vehicle accident, the Employer shall have twenty (20) days to complete its investigation, if warranted, and ten (10) days to take disciplinary action, if any, unless otherwise mutually agreed. Except for serious accidents, where the driver may be presumed to be at fault, a driver will not be removed from the payroll during an investigation of the accident."
Article 18 Section 3.... of the National language.
http://teamster.org/sites/teamster.org/files/6161478090_master_final.pdf
This language may not apply in your situation, if you are being charged with
failure to report an accident.
Have you received any written notice from the company, on their intent ?