Bikers and pedestrians can continue past the gate. The parking area with a restroom indicates the end of the White Mountain Road up to which the public can drive. From here it is less than a mile on the gravel road to the UC research station, and another 3 miles to the summit. A few steps to the side people camp here, to hike the summit the next morning. Past the research station the road becomes uncomfortable for regular bikes. It's rocky, but mostly gradual, except for the last half mile to the summit, where the road becomes steep and even more rocky.