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Park just before the Ben Lui car park, walk along the road a few yards, climb steeply, reach the ridge, walk to the summit, enjoy the great views then walk back down to the car. If this was a Munro it would be easier as there would be a zig zag path up to the ridge but it's not a Munro so it's a steep wee climb to the ridge but well worth it for the views plus it's only a 2 hour walk.