Isolation, however, is not an objective in the regional plan. Each of the urban units in the region must be readily accessible from the others, more accessible than is the upper east side of New York from Riverside Drive. Water routes, rail routes, air routes, and main or arterial highways will be carefully planned so that each center in the region may be easily and quicky reached from every other center. When it is remembered that by very far the greatest amount of daily travel by an urban population is between home and place of employment, and when it is remembered that in such cities as New York or Chicago with their overgrown central business districts, where vocations that have no possible direct connection are jumbled together and the working population must twice daily pass thousands of buildings that have no possible part in their fives, the waste of time, effort, money, becomes obvious. Though like businesses instinctively tend to group themselves, the financial and administrative interests in one group, the dry-goods wholesalers, the jewelers, the leather men, in other groups, and thereby simplify their transport problem after their workers have arrived for the day's work, these workers still waste much time every morning and evening by passing the buildings of other groups and the dwellings that house the employes of these other groups. The regional plan will reduce this waste by segregating vocational groups more effectively and will bring the homes and workshops of each group closer together.

The need of occasional intercourse between representatives of different groups will be met by express routes, rail and highway - perhaps in the near future,.air - between the urban centers in the region.

The housing value here is that the better segregation of vocations, which we can secure by intelligent regional planning and zoning, instead of by depending upon the blind instinct which has guided us up to the present, will bring home and work closer together and in smaller urban units. As a result not only will time of travel - to-day worse than wasted because of crowded cars that sap the rider's strength and vitality - be reduced, but, because more space will be available, the character of the dwelling may be improved.