When can car drivers use a cycle lane identified by this sign?

Explanation: The sign shows a mandatory cycle lane, and drivers mustn't park or drive in it during its times of operation. The lane will be marked by a solid white line on the road. Where the cycle lane is advisory, it will be marked by a broken white line. There'll also be a similar sign that shows a cycle on a blue background but without the lane represented. Don't drive in this lane unless it's unavoidable.

Category: Band 3 driving test

References: The Official DVSA Guide to Driving: Section 6, Highway Code: Rule 140, Know Your Traffic Signs: Page 35