The 2019 interim contains updated information for the Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals, 6th Edition. It is necessary to have this and the 2015 interim to have all current specification information.
AASHTO LTS-6-I2
Original price was: $144.00.$72.00Current price is: $72.00.
AASHTO 2019 Interim Revisions to Structural Supports for Highway Signs, Luminaires, and Traffic Signals, 6th Edition, 2019 Interim Revisions
American Association of State Highway and Transportation Officials , 2018