Calculating the Direction of Travel

If alignment readings for rear toe are both positive or both negative (+/+ or -/-) subtract the smaller figure from larger figure to determine total toe angle, then divide by 2.

EXAMPLE
Toe angle of left rear wheel +0.25°
Toe angle of right rear wheel +0.08°
Total Toe Angle: 0.25° minus 0.08 equals +0.17°
0.17° divided by 2 equals +0.085°
Deviation from direction of travel = 0.085°

If alignment readings for rear toe are different signs, one positive and one negative (+/-), add the two figures to determine total toe angle, then divide by 2.

EXAMPLE:
Toe angle of left rear wheel +0.25°
Toe angle of right rear wheel -0.08°
Total Toe Angle: 0.25 plus 0.08° = 0.33°
0.33°divided by 2 = 0.165°
Deviation from direction of travel = 0.165°

The result is the deviation of the actual running direction from the longitudinal axis of the vehicle.