The A43 at Towcester is closed to non-Grand Prix traffic today and drivers are advised to find alternative routes...one of which is the A508 from Old Stratford to Roade. But repairs to a burst water main has meant traffic lights have been put in at Grafton Regis with traffic stretching back for several miles in both directions. TRAFFIC ALERT: Motorists warned of severe delays in Northampton after major road is closed