Dear,

In my opinion parameters must be:

Economic (perfect budget; analyses of demand for the new construction);

Structural (materials technology; topographical problems and soil mechanics);

Environment (how much the new construction can change the environment during construction and after).

http://brage.bibsys.no/xmlui/handle/11250/274029

http://www.bast.de/EN/FB-S/Subjects/e-klimawandel/e-klimawandel.html

http://www.worldbank.org/transport/roads/toll_rds.htm

Best Regards,

Vanessa

Hello,

I think one of the most important factors, which is often overlooked in infrastructure development projects, is having objective measures to prioritize projects to ensure optimal use of limited resources. This is very important, especially if the country is in transition development stage. Often times, socio-political factors affect negatively the objective selection of projects. The economic feasibility of public projects can be easily manipulated because it depends mostly on forecasting demand for long period of time, and therefore can be deliberately skewed to favor/disfavor a certain project.

Infrastructure development authorities should have an established policy to validate economic feasibility studies for infrastructure projects after construction to extract lessons that can be used for a better selection of projects in the future. This kind of validation is performed for economic feasibility of private projects, but unfortunately this validation is not perfumed for infrastructure projects despite the massive expenditures on such projects.

I hope you will find this useful.

Dear Didier,

about the political and planning issues, I believe that should be studied:

- What transportation the government priority (train, bus, subway, cars...);

- What sort of transportation system government priority (urban design like avenues, streets, underground net...);

- Spent on expropriation of real estate (if necessary)

Maybe will be good to have contact with master plans and transportation plans of the area that You will study.

For now only occurs to me that topics.

Good luck !!

Vanessa

DOI:10.1080/01944360903329295

https://books.google.cz/books?id=OXUKAgAAQBAJ&pg=PA422&dq=FHWA+road+infrastructure+planning&hl=cs&sa=X&ei=wN_TVK3RKoHoUPGegdAD&ved=0CEMQ6AEwBQ#v=onepage&q=FHWA%20road%20infrastructure%20planning&f=false

https://books.google.cz/books?id=wfWzVKDxpggC&pg=PA19&dq=FHWA+road+infrastructure+planning&hl=cs&sa=X&ei=wN_TVK3RKoHoUPGegdAD&ved=0CCEQ6AEwAA#v=onepage&q=FHWA%20road%20infrastructure%20planning&f=false

and many others

Environment, prioritization (there are reliable models) and extremely important financial transparency.

Tkx all

future need of road as well as bridge should be taken into account

if at this moment it looks very costly but if seen with future growth,it seems to be viable.

• at the time of construction of road normally road level kept up to the surrounding,but if this is not possible any how then that road may be kept low and the pavement may be design such that water will be recharge in the below ground.
• if alone bridge is costly then bridge can be club with some amenity like cable,railway,waterway etc.

A clear Idea of the way the town or city is planned is very essential in highway and bridge management engineering. Because depending upon the vehicles that travel per min through the area and population will help you to decide the the number of lanes required and also the type of road that needs to be proposed whether cloverleaf interchange is required or some other etc etc. 

Soil plays an important role too. Hence a through study must be done on the underground water table, prior existed water bodies and underlying soil condition. This is because you would not like your roads sunk deep during the rainy season or heavy pour and definately no differential settling.

For bridges a thorough work has to be done via surveying in understanding the leveling and accessibility of the land. 

Thank you 

Cost effectiveness, which means you want the infostructure cost to be proportional to the cost of living in that specif country and not the cost of foreign contractors to come over and reap profit from donors and other sources as for example revenue from local natural resources.

Thank you

Agree with Vanessa Meloni Massara

Good question.. Please share me the best answer might you trust...

Regards…

Traffic studies, class of vehicles allowed, Soil studies, safety requirements, speed limits, environmental studies, land requirements for right of way, aesthetics, avenue plantation, road side furniture, parking requirements, drainage requirements are most of the technical parameters that need to be considered while socio-economic studies are part of all Road & bridge network.

structure must be economical and safe

thankyou design and construction