The damage to the only highway access to the region has caused huge traffic problems and the trafic direction alternates every day.Odd days, trafic flows frm Chengdu to Maoxian. Even days, traffic flows from the mountain region to Chengdu. Access is limited with only trucks carrying emergency sypplies being allowed. Permits are required and rules are strictly enforced. No reverse flow trafic is permitted for obvious reasons.