Highway Dhahran to Abqaiq

Hi,

Can please someone tell me if the highway from dhahran to abqaiq is a dual carriageway i.e 4 lanes, 2 in each direction or is it a motorway (3 lanes in each direction).

I will soon be working in abqaiq and considering living in a big city i.e dhahran or al khobar and travelling to work everyday.

Thanks in advance.