For walking, I do not think we need to obey the direction restriction imposed for vehicles, please consider removing such obligations for human.

A case in point: http://maps.google.com.hk/maps?saddr=Pan+Hoi+St&daddr=King%27s+Rd&hl=en&ll=22.286498,114.211134&spn=0.00143,0.002401&sll=22.286695,114.21155&sspn=0.005986,0.009602&geocode=FQQQVAEdIrjOBg%3BFXsQVAEd0bfOBg&brcurrent=3,0x3404010c94299bc9:0x5c6dda915652e838,0,0x34040106bd01ccf7:0x2dfb946e947104f9&dirflg=w&mra=ltm&t=m&z=19

A normal human should just walk upward and not going around to get there.