This article relates to the competence and compellability of witnesses in motor vehicle collision disputes. Under the Evidence Act 1995 (Cth) (‘Uniform Evidence Law’), all persons are presumed competent to give sworn evidence and may be compelled to do so unless proven otherwise. Effectively navigating these principles can be pivotal in building or defending a claim.
Competence of Witnesses
Section 12 of the Uniform Evidence Law presumes all persons are competent to give evidence. This presumption may be rebutted under sections 13 and 14, which address situations where a person lacks the capacity to understand questions or provide rational answers. For example, a witness may be deemed incompetent if they cannot communicate due to impairment.
In motor vehicle accident disputes, competence issues may arise if witnesses have cognitive impairments, language barriers, or lack technical understanding of accident details, insurance or repair processes. Legal practitioners should assess witnesses’ competence to ensure admissibility.
Compellability of Witnesses
Most competent witnesses can be compelled to give evidence, although certain exceptions apply. Under section 18 of the Uniform Evidence Law, a person is not compellable if:
- The court considers there would be substantial cost or delay in ensuring the person understands and answers questions, and adequate evidence has already been given; or
- The person is a close relative of a party to the proceeding and may be exempt if giving evidence would cause substantial hardship.
In motor vehicle collision disputes, witnesses may include insured drivers, third-party claimants, bystanders, experts, hire car providers, and repairers. Understanding who can be compelled to give evidence and under what circumstances is important when building or defending a claim.
Practical Implications
Competence and compellability of witnesses can significantly impact litigation outcomes. For example, if a key witness is found incompetent or not compellable, it may weaken a party’s case. Lawyers should address these issues early, particularly when dealing with communication difficulties or personal relationships.
Further, disputes involving technical evidence, such as repair assessments or valuations, will likely require expert witnesses. While generally competent and compellable, their admissibility can be challenged on grounds such as relevance or reliability.
Conclusion
Understanding the competence and compellability of witnesses under the Uniform Evidence Law is essential in disputes arising out of motor vehicle accidents. Ensuring witnesses are competent and compellable is crucial to establishing or refuting liability.
The content of this article is intended to provide a general guide to the subject matter. Specific advice should be sought about your specific circumstances.

