Speed Limits, Lane Discipline and Overtaking
Speed limits
Posted signs set the legal maximum and override any general figure. On Pakistan's motorways the general limit for cars is 120 km/h unless a sign says otherwise, with lower limits for heavy vehicles and some sections. Urban defaults and school or hospital zones are set lower by provincial notification. There is also a minimum speed on motorways: crawling in a fast lane is itself dangerous. At 100 km/h you cover about 28 m every second before you even touch the brake, so speed must match visibility, traffic and road surface.
Lane discipline
Keep to the left lane unless overtaking. Do not straddle two lanes, drift across a solid line, or sit in the right lane at a steady slow speed. On multi-lane roads, return left once the overtake is complete.
Overtaking
In left-hand traffic you overtake on the right of the vehicle ahead. Before overtaking, check mirrors, blind spot and the road ahead, signal, and confirm no one is already passing you. Overtaking is prohibited at bends, crests, junctions, pedestrian crossings, railway crossings, and where a solid line or double yellow line applies. Never overtake a vehicle stopped at a zebra crossing.
Worked example
A lorry is doing 40 km/h on a single carriageway. You see a solid centre line and a crest ahead. The correct answer is to stay behind, not to pull out. The line and the blind crest make the overtake illegal and unsafe, even if the road looks clear for the next few metres.
Traps
Treating the 120 km/h motorway limit as a target in rain; keeping right because "fast traffic belongs there"; overtaking on the left; passing on a blind bend; ignoring a lower temporary limit at roadworks.