a scale of 1/2 meaning meaing a 1:2 ratio, namely the new graph by the manager will be 1/2 unit for each dimension.
check the picture below.
so the new graph has a ramp that doesn't go to 30, but 15, 30/2, and landing platorm of 4/2 or 2 units, and the railing that used to be be 3 units tall, now is just 3/2 tall.