If you are feeling tired it is best to stop as soon as you can. Until then you should

إذا كنت تشعر بالتعب, من الأفضل أن تتوقف عندما تستطيع, حتى ذلك الحين عليك

Explanation: If you're going on a long journey plan your route before you leave. This will help you to be decisive at intersections and junctions, plan rest stops and have an idea of how long the journey will take.Make sure your vehicle is well-ventilated to stop you becoming drowsy. You need to maintain concentration so that your judgement is not impaired.

Category: Arabic - Hazard Awareness

References: The Official DVSA Guide to Driving: Section 1, Highway Code: Rule 91