Continuing project to synthesize information on highway problems.

Ngā taipitopito rārangi puna kōrero
Kaituhi rangatōpū: National Research Council (U.S.). Transportation Research Board
Hōputu: Pukapuka
Reo:Ingarihi
I whakaputaina: Washington, D.C. Transportation Research Board, National Research Council [1997]
Rangatū:Research results digest (National Cooperative Highway Research Program) no. 219.
Ngā marau: