Is there a limitation period for an employee to make a separate, separate claim for damages arising out of a motor vehicle accident?

This is not a case like Wong v. Voong 2004 ABCA 216 relied upon by the Union, where a party came forward in a personal injury proceeding arising out of a motor vehicle accident seeking to assert a new, separate claim for damages for a different individual after the expiry of a limitation period. The Employees in this case do not seek to assert a new cause of action or to claim different relief. They ask for a say in the outcome of an application commenced in time. Their participation in this application would not have the effect of exposing the Union to the potential prejudice of having to deal with a new claim that was not initiated within the permitted time frame.