In the context of a motor vehicle collision investigation, what is a crucial step after determining an offence has occurred?

The process following a motor vehicle collision investigation involves several critical steps, and one of the most significant actions is to charge the driver if an offence has been established. Charging the driver formalizes the legal proceedings and ensures that there are consequences for any unlawful behavior that led to the collision. This not only serves to hold the driver accountable but also reinforces public safety by deterring negligent driving in the future.

This step is essential as it allows for legal recourse and the opportunity to rectify any harm caused by the collision. Serving notice to the driver about the charges also ensures that they are aware of the legal actions taken against them and protects their right to respond appropriately.

The other choices do not align with the necessary actions following the determination of an offence. Conducting a public forum could be useful for community awareness but does not directly address the legal process needed after a collision. Allowing the driver to go without consequences would undermine the rule of law and could lead to further incidents. Gathering witnesses can be an important part of the investigation process; however, it comes after the determination of an offence and does not replace the need to charge the driver. Thus, charging the driver is a pivotal step in upholding justice and maintaining order on the roads.