Category Analysis:-

        Category analysis is based on the               etimate of the average number of                 trip  generated  by a set of define                   household group with the given range         of income, level of car ownership and           household structure. 

 Assumptions 

• The household in the fundamental unit in the trip generation process and most  journey begin or end in  response to the requirement of the family.
• The trip generated by the household depend upon the characteristics of that household andvits location relative to its required facilities.  Such as shape,  school and workplace.
• Only three factors are of prime importance for affecting the amount of travel to the household  I.e. car ownership,  income  and household structure. 

Trips:-

       A trip is a one way  person movement by a mechanised mode of transpose, having two trips ends, an origin(the start of trips)and destination (the end of the trip).

      Types of trips 

1. Home-based trips 

                   Home- base trips are these having one end of the trips [either origin or destination] at home of the person making the trips.                                                                        Examples:- consider trips from the home of the person making the trips of the place of work where the work and return to the home.

 Non-Home based trips:-

              Non-home based trip are those having neither end at the home of the person making the trips. 

       Examples:- The trip from the place of the work to the shop and return to the place of work.

1. The external cordon line should cover the area which is already built up and  also likely to be developed during the design period. 
2. The external cordon line Should contain all area of systematic daily life of the people oriented towards the city center and should effect be 'commuter shed '.
3. The external cordon line should be compatible with previous studies of the area of studies planned for future.
4. The external cordon line should be continuous and uniform in its course so that movement cross it only once. 
5. The line should intersect roads where it is safe and convenient to carry out traffic surveys.