Mīqāt (Arabic: ميقات, meaning 'a stated place') are the principal boundary points of the area within which Muslim pilgrims on the Hajj must be in the state of ihrām (a state of consecration in which certain worldly activities are prohibited). These prohibited activities include clipping the nails, shaving any part of the body, having sexual relations; using perfumes, damaging plants, killing animals, covering one's head (for men) or one's face and hands (for women); getting married; or carrying weapons.
It is not permissible for men during the state of Ehraam (Hajj or Umra) to travel in a covered vehicle during day time or when it is raining. This is according to all the scholars. Many scholars including Ayatullah Sistani say that it is permissible for men to travel in covered vehicle during night if there is no rain.
Women can travel in covered vehicle any time.