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Car driving for the physically challenged – All you need to know October 17, 2016

Posted by Ragesh G R in Uncategorized.
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1 comment so far

Most of us are passionate about driving and riding here. This becomes all the more important if you are physically challenged because, driving is one place where there is absolutely no difference between physically challenged person and others, movement wise. Every other place, since we use some aids like crutches, callipers, walkers, wheelchairs, our movement is restricted by how flexible these walking aids are.

Hence, the ability to drive is more important for a physically challenged person than any one else. It is not a cake walk to own and drive a car here if you are physically challenged. The rules and awareness of the rules are only recently being clarified due to many Government Orders. So below I will furnish all the details for a physically challenged person to own and drive a car (same applies for scooter too, but car is more challenging, I will tell you why)


Before buying

  1. Zero in on a comfortable car.
    1. If both your lower limbs are affected, then opt an automatic car (+modifications for hand controlled accelerator and brake)
    2. If only you right leg is affected, then you can opt for manual or automatic car (++modifications for hand controlled accelerator and brake
    3. If only your lower left leg is affected, then you can opt for an automatic car without any modifications
    4. If only one of hand is affected, then you can opt for an automatic car without any modifications
  2. Have the following documents ready, apart from usual ones like ID, address proof etc
    1. National Physically challenged ID card + Disability Certificate. In Chennai, it is provided by Government Peripheral Hospital, KK Nagar
    2. Driving Ability Certificate which tells what kind of car (Refer point 1.1 to 1.4), you can drive. In Chennai, it is provided by Government Peripheral Hospital, KK Nagar, as well as Artifical Limb Center, KK Nagar. Many RTOs prefer the latter
    3. There are many Government orders, which talk about Road Tax relaxation, Excise duty relaxation, Rules for modification etc. Have this handy, but ideally you won’t need them as RTOs will have it

Buying Process

  1. While buying, ask the dealer to give temporary registration. This step is very important. If you register your car as LMV then everything breaks
  2. While negotiating the price, tell the dealer that you are going to register it as an invalid carriage and hence you are eligible for 50% reduction in own damage premium. But since you have not already registered your car as Invalid Carriage, they may not give you 50% discount, but you might get big discount. Also, after one year when you renew, ensure you talk to the insurance people and provide them the copy of your disability and Driving Ability certificate and your RC Book which mentions “Invalid Carriage”. They will provide you the 50% discount

After buying

  1. After getting delivery of the car, make sure your dealer gives you all forms related to the car like Form 20, form 22, form 19 etc.
  2. Then you need to get the car modified from an approved agency which has type approval from A.R.A.I for its driving equipments and also the state governments approval for doing the modifications. Agencies which helped me are :
    1. Dealers | Auto Mate India (Company who makes hand controlled kit)
    2. SHREE VARI ENGINNEERING MR.SHANKAR +91 9884604824 shreevariworks@gmail.com
    3. Shankar is very helpful and will ascertain which are you belong to and what kind of equipment will that particular RTO Approve and do the modifications accordingly. He has made dreams come true for 100s of physically challenged people in Chennai. He will also provide the requirement approval documents and Govt Order copies which help you register your car and get license
  3. After getting the modifications done, ask your dealer if they can get your car registered as Invalid Carriage. If so, it will be easy. Many Maurti Dealers have the require knowledge to do so. In case of other companies, you might have to get it registered yourself (like I did)
  4. If you are doing registration yourself, get your car weighed at weigh bridge and get the weight receipt
  5. Approach the local RTO with all the car related forms such as
    1. insurance
    2. invoice,
    3. pollution,
    4. excise,
    5. sale letter,
    6. temp reg certificate
    7. Form 20 with class of vehicle as INVALID CARRIAGE
    8. N.A.M.V filled by you which says what alterations you have done to the vehicle
    9. A.R.A.I approval, govt approval as well as the certificate (which the workshop will give), for the alterations and the workshop which conducted the alterations
    10. Address proof, ID proof etc
    11. Disability ID card and Disability Certificate
    12. Driving Ability Certificate
    13. Two copies of the Chasis number on two papers done by pencil sketching
    14. Covering letter requesting the RTO to register your car as Invalid Carriage and for Tax exemption
  6. First step would be to approach RTO and get his/her signature on the forms. Then he would ask the insepctor to inspect your car and give his approval. Then he would ask you to submit the forms in the office. The registration charges are minimal since you will get 100% Road Tax exemption
  7. Be prepared to visit the RTO a 2-3 times in case needed. Once the forms has been submitted and accepted at the office, they will ask you to come after a week to collect the RC book
  8. That day, you need to pay a nominal fee of around 120 rupees to “alter your vehicle” to Invalid Carriage. You will receive the RC book that day itself, in the afternoon, evening.
  9. Ensure the class of Vehicle is Invalid Carriage and other details like color, engine, fuel etc is correct. Congrats! STEP1 Completed


  1. Learner’s License
    1. Now that you have your car registered as Invalid Carriage, go to Home
    2. Apply Online->New Learners license. Provide all the details, upload the scanned copies of all the forms, print the pre filled forms
    3. Approach the RTO Office again with all the forms in the above step as well as your RC book original and copy, Disability ID Card, certificate and driving ability certificate.
    4. Ensure you take your car for the LLR also
    5. Pay the fees at the fee counter, then see the insepector, who will approve your forms, then get it approved at the office, then get your photo taken
    6. You can download the LLR the same day evening from the same website.
    7. Wait for 1 month
  2. License
    1. Go again to the same website and apply for the New License (or Additional Endorsement, if you already have license for say a scooter).
    2. Fill all the forms, upload all required scanned documents, and take print out of the forms
    3. Visit the fee counter, pay the fees, meet the inspector, provide your driving test, get his approval
    4. Get the forms signed at the office, take your photo
    5. You can get license collected next day from the RTO Office

Enjoy your new freedom!!


The physics behind the pandemonium of driving cars November 13, 2006

Posted by Ragesh G R in Physics and Maths, Uncategorized.
Tags: , , , , , , , , , , , ,

You watch a Grand Prix on a Sunday evening, and your mother exclaims, “What pleasure could you possibly derive from watching the same cars go round and round the same track for 2 hours?”.

But there are plenty of things to learn as we watch the cars go by. In fact even without watching it, just a little contemplation on your side is enough to understand the nuances of the dynamics of a vehicle as it goes through sweeping corners at break-neck speeds.

What you see in Grand Prix can be applied in real-life situations. Contrary to popular belief, Grand Prix races do not encourage perilous driving styles. In fact they encourage you to drive safer, better and more efficiently, being cogniscent of what your vehicle is doing.

The secret of the tyres

The silken smooth tyres of the Grand Prix cars and bikes might give an impression that they are very slippery but it’s not so. The friction produced between the tyre and the road is directly proportional to the area of contact, hence the smoother and flatter the tyre, the better the grip. This is because when two very smooth surfaces come into contact, the distance between them is so small that it is comparable to atomic distances and hence nuclear strong forces take over (The same reason you feel grip when you run your finger on a marble floor).

This theory has an exception though, during rains. Then if you use a slick (smooth) tyre, the water that is trapped between the tyre and the tarmac does not have any place to go and formes a layer of accumulated water between the tyre and the road, causing a phenomenon called “Aquaplaning” or “Hydroplaning”, in which the grip reduces drastically and you feel as if your car is skating on ice. Hence during rainy days, it is advisable to change to a tyre that has deep treads that have channels to push away the accumulated water through sides.

Going around corners

Ever thought why the Grand Prix cars seem to be weaving around the track, changing lanes, sticking to a specific line every time? There is a beautiful science behind it. In fact it is very useful in day today life. I use it often. But you must stay within your lane. Every corner has a specific line which will provide you the fastest way around it, called the “Groove” or the “Racing line”.

The simple theory behind it is the less steering input you give, the faster your vehicle can travel, and the more stable it will be. That is because when you turn the wheels, especially the back wheels are not exactly pointing in the direction the car actually goes. Hence every moment the back wheels point along the line of the tangent to the curve that you are describing. Hence there is a constant force or acceleration applied to the vehicle. A component of the force produced by the wheels is expended in over coming the frictional force. Hence the lesser force you have along the direction of the motion of the car.

So the best way to approach a corner is : Enter from the outside, cut through the inside (apex) of the corner and exit through the outside of the corner, as shown in the picture. Our aim is to describe an arc that has the least curvature or most radius of curvature and the least circumference as possible. Also this method puts less stress on your tyres, and less g – force on you, hence, longer life for the tyres and smoother ride for you.

Cutting the apex of the corner

If you follow the inside line through out, then you have to brake and reduce the speed, hence you use more time.

If you follow the outside line, still the curvature is high and the circumference too is high, hence reduced speed, longer distance, hence more time wasted.

The secret is not to perceive the road as a whole and blindly trying to go parallel to the edges of the road. The secret lies in being able to see the straightest path between two points. The curves in the road need not bother you. Why go in a zig-zag way around a series of corners if you can find the straightest path between them.

As the followig diagram depicts, though the road seems to be winding in a zig-zag way, there is a fairly straight path through the series of curves.

Driving Line

The slip-stream

Now, why do Grand Prix cars pull up behind the car in front and sling shot their way past to over take? It is not any ambushing strategy. But it the exploitation of a beautiful phenomenon in fluid dynamics.

When a vehicle moves at speed, it creates turbulence in the air. And the turbulent air tends to stick to the vehicle more. The less aerodynamic the vehicle, the more the turbulence. Now due to this air behind a vehicle is moving and hence when you drive behind it, the relative velocity of the air in front of you w.r.t to you is less. Also since the vehicle in front drags some air with it, there is a low pressure created in its wake. Hence, for you the effect is low drag, and low drag means lesser energy to cut through the air. Hence with the same amount of energy, you can travel faster, travel at the same speed with less amount of energy. Hence you drive more economically. Now this a strategy I use in the high ways. But again be careful, do not go too close to the vehicle in front.

Thus with the help of physics, we can exploit the most out of our cars’ performance. Nature hides many secrets for us to exploit. It is up to science to find it out and explain it and it is up to us to use them to our benefit. I have tried to be as simple and basic as possible. Happy Driving!!

Note: I should clear some things out. When I say cut the corner, I mean in a one way highway with medians (like Old Mahabalipuram road), when u apply the same technique to a two way road like the E.C.R, read road as “lane”. Anyway the techniques are going to be the same, only that you are going to stick to your lane.

So the 2 figures will now look like this :

and this:
Just a little bit of adaptation :).