other instruction that can be directed to the motorists in the vehicles the section 11 7 will be described later with regards to height contents durability mobility etc fig1 b depicts an insert 11 10 presenting the side view 11 9 of an extended mobile flat unit 10 2 the extended post 11 4 is viewed from the side fig1 c illustrates an insert 11 12 presenting the top view 11 11 of an extended mobile flat unit 10 2 the extended post 11 13 is viewed from the top and a cavity 11 14 is embedded in the unit 10 2 fig1 d shows an insert 11 16 presenting the top view 11 15 of a retracted mobile flat unit 10 2 note that the post 11 17 is rotated into the recessed cavity 11 14 and prevents tires from damaging the retracted post when the tire rolls over the mobile unit 10 2 a dotted rectangle 11 18 illustrates one of the rubber tracks that are located beneath the unit 10 2 fig1 a depicts the front view 12 1 of a mobile flat unit 10 2 the rubber track 11 18 mentioned earlier is wrapped around two cylindrical shafts 12 3 and 12 4 as the shaft 12 4 rotates counterclockwise the unit moves in the direction 12 7 the arrow 12 5 presents the side view shown next fig1 b illustrates the side view 12 5 of a mobile flat unit 10 2 the rubber track 11 18 mentioned earlier as well.