- Gökaşar, I. Functional classification of Roadways in Istanbul, ISBAK A.Ş. (Principal Investigator), July 2018.
- Gökaşar, I., Editor for İETT (Public Bus Authority and Operator of İstanbul) Institutional Publications: (1) BRT Implementation and Operation, (2) Service Quality Management Model, (3) Intelligent Transportation Systems, (4) Sustainability: Energy and Environment Management Model, (5) Garage Operation, (6) Field Operation, (7) Bus Line Assignment, Optimization and Analysis, (8) Bus Fleet Management Model, December 2016.
- Gökaşar, I., Modeling and Analysis of Ramp Metering Implementation at Şirinevler, TÜSSİDE Research Project, November, 2016.
- Gokasar, I.,and Emir, E., Changes in Traffic Safety Policies and Regulations in Turkey (1950-2010), International Association of Traffic and Safety Sciences (IATSS), Tokyo, Japan, October 2011 and January 2012.
- Gokasar, I., Rationale of Kocaeli Logistic Master Plan, March 2011.
- Ergun, G.,Gokasar, I., Traffic Impact of Istanbul Straits Road Tunnel Crossing (ISRTC) on the Historical Peninsula Interim Report: Assessment of the Present Situation, December 2010.
- Ergun, G.,Gokasar, I., Traffic Impact of Istanbul Straits Road Tunnel Crossing (ISRTC) on the Historical Peninsula Final Report, February 2011.
- Gokasar, I. and ISBAK Inc., Acıbadem-Akasya Traffic Impact Analysis, December 2010.
- Gokasar, I. and ISBAK Inc., Suryapı Tantavi A.K. Traffic Impact Analysis, November 2010.
- Yasar, I. and ISBAK Inc., Kazlıçeşme Transfer Center Project Traffic Impact Analysis, May 2010.
- Ergun, G., Yasar, I. and ISBAK Inc., Traffic Impact Analysis of Proposed Developments (Forum Istanbul, Ora Istanbul, Caprice, Kemerpark Evleri, Miyansera Evleri ) in Bayrampasa , March 2010.
- Ergun, G., Yasar, I., and ISBAK A.S. Trafik Etut ve Proje Grubu, , Traffic Impact Analysis of Proposed Zorlu Center in Besiktas, Zincirlikuyu, October 2007.
- Ergun, G., Yasar, I., and ISBAK A.S. Trafik Etut ve Proje Grubu, Traffic Impact Analysis of Proposed Five Star Hotel and Convention Center in Bomonti, July 2007.