Flashing Arrow Boards Flashing Arrow Boards –1089-6 –(F) Material Certification Furnish a Type 3 material certification in accordance with Article 106-3 for all new flashing arrow boards, a Type 7 material certification for all used flashing arrow boards, and wind load certifications required in Subarticle 1089-6(D) for all new and used flashing arrow boards before use.