According to the CDL manual, how do wet roads affect the stopping distance of a tank vehicle compared to dry roads?

49 CFR 383.119(i) (operating practices and procedures not otherwise specified, the closest fit since wet-road stopping distance is not covered by subsections (a)-(h)); AAMVA CDL Manual Section 8.3.4, p.8-8-2

Doubling your stopping distance on a wet road is a huge safety margin to lose, especially in a vehicle that already handles differently because of shifting liquid cargo. Drivers who don't account for this are the ones who end up too close to the vehicle ahead when conditions turn against them.