Roadside testing powers under S6(4) RTA 1988 apply to which scenario?

Answer: B — S6(4) RTA 1988

Roadside testing powers are designed to quickly assess whether a driver is unfit to drive while the vehicle is in use. Under this provision, a police officer can require a breath specimen at the roadside from someone who is driving, is attempting to drive, or is in charge of a vehicle, when there are reasonable grounds to suspect alcohol or drug impairment. This is the scenario where the test happens on the spot, before any arrest, using a portable breath-testing device. If the person refuses or cannot provide a sample, they commit an offence under the related provisions. Other subsections cover different situations (such as sampling after arrest or requiring other forms of sample), not the roadside breath test itself.