Hi Harsh, yes the summit has been made vehicle free in line with the historic and cultural sensitivity of the area also safety for those walking and sharing the road. However if your parents have their senior or disability cards with they can get access from the barrier . You will need to have these with you though and it may be possible to check with the park before you go to ensure that they will be accepted .The summit is well worth the walk up and one of the best free vantage points.

There are buses available and the Hop and Hop off goes there as well. A good 20mins walk.

Yes all the way to the top to the monument

Driving it's about 3k from gate to summit. Walking is a bit shorter and a gentle steepness at the end obviously. My daughter and niece ran both ways but stopped off at the coffee van on way back. Scrounging that off me. Choose a nice day though.