(a) Reasons why road transport is preferred to rail transport are:
(i) Road transport offers door to door delivery from manufacturers to customers.
(ii) The maintenance of motor vehicles is much less than that of trains.
(iii) Road trans-port vehicle begins its run as soon as a load is picked up and does not operate on a fixed time table like trains.
(iv) It is a more suitable means of transporting perishable goods.
(v) Road transport is faster than rail transport.
(vi) Road transport is more flexible than rail transport.
(b) Functions of Nigeria Airport Authority are:
(i)The Nigeria Airports Authority provides facilities for landing and fuelling in all airports in Nigeria.
(ii) The airports authority also collects airport taxes.
(iii) It maintains facilities in all airports in the country.
(iv)The Authority is in charge of the operation of the control tower.
(v) The Authority sees to the environmental sanitation of the airport.
(vi) It makes sure that the air space is free for the movement of aircrafts; that the tarmac is cleared for the landing and take-off of aircrafts and that the goods of the passengers are safeguarded.
(vii)The Airport Authority makes available warehouses in the airports where luggage are kept.