LACT

Los Angeles City Traffic
http://www.ekouhou.net/%E6%91%A9%E6%93%A6%E6%9D%90/disp-A,2007-277418.html

http://www.nisshinboauto.com/brakedefs.html
LACT: Los Angeles City Traffic vehicle test, used to evaluate life (wear) and noise generation of friction materials.

非公式訳:
摩擦材料の寿命(摩耗)とノイズ発生とを検査するのに使われる。