2/3 movement.

[treadasaurusrex]

For what it's worth . . . here's the house rule that a number of us use in shared, online Vassal play. It makes game play & flow SO much easier!
 Road Movement for Mechanized & Foot Units

All FOOT & MECHANIZED units may move on roads at the rate of 1/2 a Movement Point (MP) per road hex, just like MOTORIZED units

Geez, even this old grunt can do the 2/3 math.  Oh, wait, right, you were DAT, not a CDAT.  lol... just kidding...

Discerning & discriminating CDATs also hate the 2/3 movement rule on roads.