Go along the dual carriageway, the Cirencester North-South outer bypass which links the M4 at Junction 15, Swindon, with the M5 at Junction 11a, Gloucester. That road is identified on the road signs and road maps as A419(T) from Swindon or A417(T) from the M5. It is about 20 or so minutes road time from both the M4 and the M5 junctions, traffic permitting. Come off the bypass at the Burford Road Junction (named on the road signs). There is a big services located there - fuel, food and a Travelodge.
At that junction, go up the slip road to a roundabout. At the roundabout, turn away from Cirencester Town Centre, (If you are coming from the south, go over the bypass and straight over another roundabout) and up to the traffic lights. Turn right at the traffic lights and follow the road to a T-junction. Turn right, the road takes you back over the bypass, and then turn first left into Kingshill Lane. The Ground is half a mile on the right, past Kingshill School and the Council Playing Fields.
NB: "Cirencester Town FC and Arena" is signposted from the bypass.