twenty-one ford zephyr saloon cars were converted to the ferguson 4-wheel drive and anti-lock braking system at the instigation of the ministry of technology to obtain user experience with the system.preliminary instrumented investigations indicated that some alterations and adjustments were necessary to optimise the braking system and make it acceptable for use.the optimized system enabled shorter braking distances to be obtained with the anti-lock braking system in operation than without it on both wet and dry surfaces.use of the anti-lock braking system also resulted in the car remaining directionally stable under all conditions of braking.some tests indicated that the four- wheel drive system had little effect on acceleration or maximum speed of the car under dry road conditions.part 11 of this report, "an assessment in police operation", has been published by the home office.

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