Where stations are ten blocks apart there is no such overlapping of streams of travel, but if there were sufficient travel to demand it there would be additional stations, in which case the beneficial effects of the elevated would be intensified and the detrimental effects diminished, so that it might be said to be the fault of the property that it has not sufficient business strength to make an elevated road a source of additional value rather than the reverse. While an elevated road is always detrimental in a residence section, and partly detrimental and partly helpful in a small business section, in the most patronized retail shopping sections it is a strong advantage.

The influence of an underground road is similar to that of the elevated, except that the feature of advertising is absent. The longer haul of an underground road creates residence values at still greater distances, and also still further intensifies values at the center of the city and at all stations, especially express stations.

Bridges, ferries and tunnels, which serve as additional outlets to a city, co-operate with long distance transportation facilities, and any change in their location or any competition of new bridges or tunnels by changing traffic routes cause marked shifting of values. Thus the construction of the. Brooklyn Bridge by diverting traffic from the old Fulton Street ferry, and throwing it half a mile back from the river on either side, removed millions of dollars of value from the streets leading to the ferries, especially in Brooklyn.