In areas where traffic is composed primarily of enemy autos, trucks, and motor convoys of various kinds remove danger signals from curves and intersections. (2) When the enemy asks for directions, give him wrong information. Especially when enemy convoys are in the neighborhood, truck drivers can spread rumors and give false information about bridges being out, ferries closed, and detours lying ahead. (3) If you can start damage to a heavily traveled road, passing traffic and the elements will do the rest. Construction gangs can see that too much sand or water is put in concrete or that the road foundation has soft spots. Anyone can scoop ruts in asphalt and macadam roads which turn soft in hot weather; passing trucks will accentuate the ruts to a point where substantial repair will be needed. Dirt roads also can be scooped out. If you are a road laborer, it will be only a few minutes work to divert a small stream from a sluice so that it runs over and eats away the road. (4) Distribute broken glass, nails, and sharp rocks on roads to puncture tires. (b) Passengers (1) Bus-driver can go past the stop where the enemy wants to get off. Taxi drivers can waste the enemy’s time and make extra money by driving the longest possible route to his destination. (c) Oil and Lubrication (1) See 5 b. (2) (b). (2) Disconnect the oil pump; this will burn out the main bearings in less than 50 miles of normal driving. (d) Radiator (1) See 5 b. (2) (c). (e) Fuel (1) See 5 b. (2) (d). (f) Battery and Ignition (1) Jam bits of wood into the ignition lock; loosen or exchange connections behind the switchboard; put dirt in spark plugs; damage distributor points. (2) Turn on the lights in parked cars so that the battery will run down. (3) Mechanics can ruin batteries in a number of undetectable ways: Take the valve cap off a cell, and drive a screw driver slantwise into the exposed water vent, shattering the plates of the cell; no damage will show when you put the cap back on. Iron or copper filings put into the cells i.e., dropped into the acid, will greatly shorten its life. Copper coins or a few pieces of iron will accomplish the same and more slowly. One hundred to 150 cubic centimeters of vinegar in each cell greatly reduces the life of the battery, but the odor of the vinegar may reveal what has happened. (g) Gears (1) Remove the lubricant from or put too light a lubricant in the transmission and other gears. (2) In trucks, tractors, and other machines with heavy gears, fix the gear case insecurely, putting bolts in only half the bolt holes. The gears will be badly jolted in use and will soon need repairs. (h) Tires (1) Slash or puncture tires of unguarded vehicles. Put a nail inside a match box or other small box, and set it vertically in front of the back tire of a stationary car; when the car starts off, the nail will go neatly through the tire.