This Practice Note explains that the quality of highway maintenance required depends on the expected ordinary traffic on the highway in question. It also explains that individuals who sustain injury from danger on a highway can sue the highway authority for negligence and that if the highway authority can prove it took reasonable care it has a statutory defence under the Highways Act 1980. It also notes that at common law, the duty is to keep the highway in reasonable condition, not improve it. The authority must conduct routine inspections of the highway surface and have a system for incoming reports of damage, but the duty to keep the highway in repair does not extend to the damage done by extraordinary traffic.