The comparison between various mode of transportation are as follows  :-

Transportation has developed along three basic mode of transport are :-

1.  Roadways or Highways
2.  Railways 
3.  Waterways 
4.  Airways 

The original Lowry was published in 1964 and since then several important extensions of the original model have been applied to practical planning problems  (Hutchinson 1974) . The Lowry model conceives of the major spatial features of an urban area in terms of three broad sectors of activity therefore employment sectors,  the population serving employment and the household sector. 

The movement of people and goods in a city, referred flow, is the joint consequence of land activity and capability of the transportation system to handle this traffic flow exactly like that principle of demand and supply. There is a direct interaction between types and intensity of land use and transportation facilities provided. Land use is one of the prime determinants of movement and activity therfore,  trip generation which needs streets and transport system for movement. 

CLOCK RATE--

• the clock rate or clock speed typically refers to the frequency at which the clock generator of a processor can generate pulses, which are used to synchronize the operations of its components, and is used as an indicator of the processor's speed.
• It is measured in clock cycles per second or its equivalent, the SI unit hertz (Hz).
• The clock rate of the first generation of computers was measured in hertz or kilohertz (kHz)