Replacement , repair and maintenance of arrow boards will be incidental to the work of this section. Payment will be made under: Pay Item Pay Unit Flashing Arrow Board Each
PORTABLE CHANGEABLE MESSAGE SIGNS -1 DESCRIPTION Furnish, install, operate, maintain, relocate and remove portable changeable message signs. -2 MATERIALS Refer to Division 10. Item Section Portable Changeable Message Signs 1089 -7 Provide portable changeable message signs listed on the NCDOT APL . Poor performance of portable changeable message signs at any site, whether or not related to a specific contract, may be grounds for non -acceptance of a product on any project under contract. -3 CONSTRUCTION METHODS Mount all portable changeable message signs on a trailer or truck so as to support the message board in a level position and in accordance with the plans . Align and sight the portable changeable message sign to provide optimal driver visibility. Messages on a portable changeable message sign shall consist of no more than 2 phases, and a phase shall consist of no more than 3 lines of text. Each phase shall be capable of being understood by itself, regardless of the order in which it is read. Messages shall be centered and uppercase within each line of the legend. If more than one portable changeable message sign is simultaneously legible to road users, then only one of the signs shall display a sequential message at any given time. As guidance, the display time for each phase shall be at least 2 seconds, and the sum of the display times for both of the phases shall be no more than 8 seconds. Sign operato r will adjust the display rate so the 2 phase message can be understood by the motorist twice when approaching the sign at the posted speed limit . Relocate the units for the various stages of construction as shown in the plans or as needed to inform the m otorists. Provide an experienced operator for the portable changeable message sign during periods of operation to ensure that the messages displayed on the sign panel are in accordance with the plans and Suba rticle 1089 -7(D) . Change the controller passwor d from the factory default and periodically change the controller password to deter unauthorized programming of the controller . Using two levels of password security is recommended such that operators at one level may only change message sequences displayed using preprogrammed sequences and operators at a higher level may create and store messages or message sequences. Lock the controller in a weather and vandal resistant box when not in use and after changes to the messages are made. Ensure that the mess age sign is illuminated properly to meet the existing light conditions, and that all adjustments for operation of the sign are made as needed to properly guide motorists. Expedite repairs due to failure, malfunction or damage to a portable changeable message sign. Furnish another changeable message sign during the repair time. Repair or replace portable changeable message sign immediately; otherwise, suspend all construction activities requiring the use of the sign until the sign is restored to operation.