D-100 İSTANBUL–GEBZE–İZMİT ROAD:
CONSTRUCTION OF INTERCHANGES

Completion of Earthworks, Structures, Bridges, Superstructure, and Miscellaneous Works on the D-100 Istanbul–Gebze–Izmit State Road (including Çayırova, Hanibal, Gebze East, Dilovası, and Eynerce Interchanges).


This project, implemented along the Gebze–Izmit section of the D-100 dual carriageway between Istanbul and Kocaeli, aimed to relieve heavy traffic by eliminating at-grade junctions and streamlining the corridor through new grade-separated interchanges and infrastructure upgrades.

Construction

D-100 İstanbul-Gebze-İzmit Road
Construction Methodology

A total of five interchanges were constructed, incorporating both flyovers and deep pile-supported underpasses (commonly known as "cut-and-cover" or "split-level" interchanges). In addition to the interchange works, pavement improvements were carried out along a 38 km stretch of the route. The existing asphalt surface was milled where necessary and replaced with a high-performance stone mastic asphalt (SMA) layer. All construction activities were carried out under live traffic conditions with careful phasing and traffic management.


Client: General Directorate of Highways, 1st Regional Directorate

Location: Gebze, Kocaeli / Türkiye

Construction Period: 2015 – 2020