121. Using vehicle in unsafe condition. Any person who drives or causes or allows to be driven in any public place a motor vehicle or trailer while the vehicle or trailer has any defect, which such person knows of or could have discovered by the exercise of ordinary care and which is calculated to render the driving of the vehicle a source of danger to persons and vehicles using such place, shall be punishable with fine which may extend to two hundred and fifty rupees or, if as a result of such defect an accident is caused causing bodily injury or damage to property,[ with imprisonment for a term which may extend to three months, or with fine which may extend to one thousand rupees, or with both].