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Interim Advice Note IAN 93/07 "Driver Location Signs - Interim Performance Specification" can be viewed at either of the below locations:
HA Staff via the Highways Agency Portal
Chief Highways Engineer Memo CHE 194/07 is unfortunately only available online via the HA Portal intranet. If you wish to obtain a copy of CHE 194/07 please contact your local Highways Agency representative or email the TIM team.