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And on the other hand, if the vehicle were not to be thrown up in air it means that they are doing much more than 125 before the crash.

But that is one horrific crash. Driver's seat is no where seen. The passenger's seat and rear bench or bent back ward :Shockked:. Tires are punctured. Would hitting something stationary puncture the tires?

You are right, but even in that case, once the vehicle has no contact with the road, the speedo reading can be anything unrelated to the vehicle's speed- as dhanush was saying.

just what i was thinking.
There might be a VSS in between, but the final drive is coming from the moving wheel itself.
A car in air, with the accelerator pressed would register the speed as dictated by the wheel.

If it was the wheel speed, then if I spun the car wheels on a wet road, or on a mucky road the vehicle speed would have been ballistic even though I was at the same spot....
I agree with vikram_d, his explanation makes the most sense.

um,this would be similar to what happens on a rolling road.

I think the driver fell victim to the fascination of man for machines. A new car ... lets see how much it can do ... of course it is a big mistake to try that on city roads ... I mean it was a case of giving in to temptation with disastrous results rather than plain stupidity.

--Ragul

Look closely speedometer it's 120kmph

A bus hit a traffic signal post at Lissy Jn. in Kochi today.

CBR Crashed into a median at the NH-47 by-pass (between Palarivattom-Vytilla strech). Pics from friend's fb account. Saw this myself today when going to Vytilla. My friend says that this was the first CBR delivered in Kerala (can't confirm). No news on the rider - hope he is all right

Aw man, its gotta hurt! Just out in the market and already in this thread! Feel sorry for the bike!

I hope the rider was wearing a helmet.
The crash bar is not seen on the bike. I find many youngsters avoid fitting the crash bar for aesthetic reasons. I feel, the presence of a crash bar may reduce the injuries to your leg and damages to tank etc to some extend, especially during falls due to skidding.

Speedo is not connected to any wheel in cars, it is connected to gear box. In bikes it is connected to front wheel.

Conversely, the wheel must be spinning while engaged in gear, in cars.

In older cars, it was connected to the GB by a worm gear. In current MPFI cars, it is just connected to a sensor in the engine.

A report in The Hindu says the deaths in road accidents during 2010 is 1,07,138. This figure is not complete, as the report mentions, as the data is being collated.

Persons killed per 100 accidents is 24.7 (2008).

Some of the reasons attributed to the increase in number and rate of accidents

* Enormous increase and growth in population of vehicles in big cities.
*Easy availability of driving licence ( reason is obvious)
*Increasing tendency of consumption of liquor while driving
*Pride and ego involved in fast driving

Some of the remedies :-

*Checking/setting and enforcing blood alcohol concentration limit for drivers with random breath testing at sobriety check points.
* Removal and safe custody of the vehicles including their loads which have broken down or which have been left standing or have been abandoned on a highway
* Speed Control
* Separate lanes for Buses, Cycles etc.
* Introduction of Mini Buses
* Need for recognized driving schools.

The article cautions against construction of speed breakers in haphazard manner, opining that they affect traffic flow and are safety hazard if not properly constructed.

It also opines that the traffic personnel are not controlling traffic and discharging their duty effectively.

Another article mentions that continues driving results not only in fatigue, hypertension, diabetes and coronary heart disease due to stress, irregular diet, sleepless nights and mental agony but have high chances of developing diabetic neuropathy (loss of sensation of legs) or nephropathy ( swelling of legs ) due to continuous driving and that he is likely to lose his control at the accelerator or brakes at any time.

An ENT surgeon reports that many drivers who got to him for treatment are hard of hearing, caused by the high frequency AV systems combined with noise pollution.

A sensor in the engine will measure engine speed and not the speed of the car. It's not a direct relation, as every gear in the gearbox will produce a different reduction in speed. The vehicle speed sensor has to be mounted so as to read the rotational speed of the output shaft of the gearbox. Further reduction in speed only occurs in the differential or in the hubs(rarely) and both of these are constant values.