“Lying police officers“ and their insidiousness. How to pass IDN?
For those drivers who do not pay attention to road signs, crosswalks and do not observe the high-speed mode, thought up IDN - artificial road roughnesses. And simply - “lying police officers“.
They on roads became recently much, especially in residential zones and at unregulated crosswalks of streets. Will - bondage it is necessary to brake. But not all are able to pass these roughnesses correctly.
I as to the autoinstructor should devote to moving through them special occupation with physics elements. And not only for “teapots“, but also for drivers with some experience.
When we press a pedal of a brake of the moving car, brake forces arise in the place of contacts of wheels with the road. They are directed back, as shown in drawing. But at once force of inertia which pulls the car forward does not allow to stop to the car. This force is applied to the center of masses which is much above a road surface.
Two forces operating in opposite directions and attached to different places are called the moment of forces in physics. This moment tries to press forward part of the car to the earth, and back to raise. Springs of a forward suspension bracket at the same time contract, load of levers and bearings increase. And that is stronger, than braking is more active.
And if we during braking run over “the lying police officer“, then the forward suspension bracket receives also blow from below. In addition to loading from above.
The suspension bracket will bear one such double blow. And, probably, will stand ten. But if so to go regularly, then the car long will not stretch.
Therefore it is necessary to brake before roughness in advance. And for meter - two to release a pedal of a brake. Then the nose of the car will manage to rise, and the blow will be only from below which will be apprehended by soft uncompressed springs. If you noticed an obstacle late and did not manage to reduce speed, it is all the same necessary to release brakes - the blow will be strong, but only on the one hand.
So to pass road roughnesses, artificial and natural, it is better at a uniform low speed. Everyone can experimentally determine its size - we pass so that in the car nothing rattled.
Once journey through wooden hemp, on height equal to a road gleam of the car was one of elements of sports automobile all-round. We, approaching them, added to gas, raising a car nose. And over them braked, raising a tail. It is possible to jump so and through IDN, but it is necessary to train.
Recommendations to pass “lying police officers“ under some corner to them meet. Then wheels in turn move an obstacle, and load of a suspension bracket decreases. But at the modern multirow movement it is not always possible. Just it is necessary to reduce speed.
And here the biggest mistake which I regularly observe as at beginners, and drivers with an experience. They are so absorbed by process of moving through “the lying police officer“ that do not notice pedestrians on the transition allocated with these most police.
The obstacle is stacked not to tease drivers and to protect this crosswalk.
Protect a suspension bracket of the car, and at the same time and the pedestrians crossing the road. They, according to Rules, - full participants of traffic.