If one know of a family member or friend being arrested without cause and whose whereabouts are being kept secret by the police, they can file an RTI application at the police station asking for information on the whereabouts of the person.

Since the information is relating to the life and liberty of a person the police are bound to give the required information.

No, unless a person has been formally arrested by the police, he/she cannot be held in custody . Holding someone in custody against their will is a serious offence on the part of the police and will amount to what is called ‘Illegal detention’.

If the police summon someone for questioning, they must conduct the interview promptly and efficiently. The police cannot make someone wait endlessly at the police station and in such circumstances; the person is free to leave whenever they want.

If you are aware that a police officer is  illegally detaining a person, you can complain about the offending officer to his senior or to a magistrate.

You can also get the arrested or detained individual's lawyer to go immediately to the High Court or the Supreme Court and file a ‘Habeas Corpus' petition seeking the persons immediate release.

• No person can drive a motor vehicle in a public place unless the vehicle has been registered by a registering authority of the government of India. The vehicle must clearly bear the mark or plates of registration and the certification of registration or RC book must be carried at all times when driving the vehicle
• A vehicle’s registration certificate is valid for a period of 15 years from the date of issue and the same can be renewed thereafter for 5 years subject to inspection and  the vehicle’s road worthiness
• Temporary registration certificated are valid for a period of one month only from the date of issue and cannot be renewed
• Registration or its renewal can be denied if the registration authority has reason to believe that the vehicle is stolen, if it does not meet the prescribed mechanical fitness standards, if the vehicle does not meet emission norms or if the applicant fails to produce required documentation and past registration proof
• The registration of a vehicle, in any state, that has been done in accordance with the Motor Vehicles Act , is effective and valid across all States and Union Territories of India
• If a vehicle is kept in another State for over a period of 12 months then the vehicle must get a new registration from the state that it is being kept in. That is, if the owner of a car with a KA registration moves to Chennai and lives there for a period of over a year, the vehicle must have its registration changed to a TN plate
• When transferring a registration to a State other than the state where the vehicle was originally registered, a No Objection Certification must be gotten

• Driving on public roads is not permitted without a valid Driver’s License
• Every Indian national is only permitted to hold one Driver’s License. You cannot hold a DL from multiple RTO’s or States
• A Learners License or Driver’s License is valid throughout all States and Union Territories of India
• Each class of motor vehicle requires a separate mention on the license. For example if you have a license mentioning only permission for LMV or car, it does not give you the right to you ride a motorcycle on the road.
• No one can drive a transport vehicle unless they have the special license to do so 
• You must be 18 years of age to be eligible for a Driver’s License of a private vehicle
• To be eligible for a license of a public or transport vehicle one must be a minimum of 20 years of age
• An individual on turning 16 years of age can apply for a permit to drive/ride a motor vehicle whose engine capacity is less than 50cc
• A Learners License is valid for six months from the date of issue
• A Driver’s License is valid for a period of 20 years from the date of issue or until the person attains fifty years of age, whichever comes first

Reference Source: Motor Vehicles Act, 1988