Gaziantep
Impact

Many elements of the Jansen plan were ultimately put into action, and it had a significant influence on how Gaziantep was built during the 20th century. It especially shaped the city's transport network: the construction of a rail line on the north side, the opening of new transportation axes such as İnönü Cd, and the expansion of existing roads were all realized. The expansion of commercial areas along the old Aleppo road led to the development of İnönü Cd as one of the city's main commercial axes, a role it still plays today. The airport area he proposed, however, was never built – in the 1950s, as urbanization and population growth created new demand, the area was turned into a residential zone instead.

The planned residential expansion to the south did take place, as did the proposed relocation of the cemetery to the northeast, but ultimately the main direction of residential expansion shifted to the northwest instead. This is partly because the hilly area to the south is less conducive for construction. The industrial zone on the northeast was built, but the adjacent workers' quarter never materialized. Although the recreational areas to the north were never built, the Alleben green belt became an important green space in the city, and it remains to this day (although some of it has since been turned over for new construction). Jansen's recommendation of low-rise development also succeeded at preserving the silhouette of the city until the 1970s.

One failing of the Jansen plan was that it significantly underestimated the population growth of the city during the next 50 years, particularly after 1945. This lack led to the growth of uncontrolled, unplanned settlements in the city. In addition, Jansen's general non-intervention policy with the old city center proved insufficient to maintain its character – in the absence of managed oversight, many old buildings ended up deteriorating, ultimately getting demolished, and then being replaced with new structures that architecturally did not blend in.
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