The road from The Gap to Fraser's Hill summit is a single-lane affair — eight kilometres long, climbing sharply through dense forest, with passing places but no room for two vehicles to travel simultaneously. To manage this, traffic alternates by the hour: uphill in one hour, downhill in the next. The precise schedule shifts occasionally, so check before you go, and time your departure from the lowlands to arrive at The Gap at the start of an uphill window. Arriving just after the window closes means a wait of up to an hour in a small car park surrounded by forest, which is honestly not the worst way to spend an hour — the trees come right down to the edge of the road and the birdwatching from the car park is genuinely good.
The drive up is part of the experience. The road climbs through increasingly dense montane forest, switching back and forth against the ridge, with occasional glimpses down the valley behind you. You cross the state boundary from Selangor into Pahang somewhere on the way up. The road is in reasonable condition but requires attention — narrow, with the occasional pothole and a tendency to be slippery after rain. Take it slowly and enjoy the forest.