Accessable highway above E on Cairo map via glitch

read the definition of a glich vs an accesible spot using jump button ;)

As in previous posts roofs were always accesible in the BF series and this is not an exemption since on the roofs you have stuff added by the devs to help you jump from one to another.. 

You can counter them using their own weapon other roof or sniper rifle/rpg/grenade/grenade launcher/vehicle etc... in the full release you will have a ladder (skill in operator) to even get on roof faster without any SKILL