All enforcement relating to TRO is undertaken by the Police. However, the Police have limited resources to enforce this type of restriction (especially environmental restrictions). Restrictions with "except for access" clauses quickly fall into disrepute and are notoriously difficult to enforce. However these can be needed to permit HGV access to local shops, businesses, residential properties for deliveries/removals etc. For this reason, enforcement commands a low priority and therefore, where possible, physical measures will be introduced to prevent any abuse of the restrictions - the installation of signs alone are wholly ineffective. Restrictions will not be used if there is no suitable alternative route for the displaced traffic.