Abstract

Assessing the current levels of greenhouse gas (GHG) emissions from road transportation projects allows for benchmarking and is essential for potential emissions reduction. The objective of this study was to estimate the GHG emissions associated with the construction and operation of three road cases—two primary roads and one secondary road network—in Abu Dhabi, United Arab Emirates. The GHG emissions produced by the study cases were estimated using the RoadCO2 estimation tool. Results showed that the total emissions (in kg CO2e/m2/y) range from 76 for the secondary road case to 1100 for the primary road cases. The operation phase is responsible for 94–98% of these emissions; the construction phase is responsible for the rest. Road works contributed the most to GHG emissions during the construction phase. The contribution of the remaining categories of the construction phase fluctuates within a certain case and among the considered cases. The equipment used in the construction phase for the three cases contributed 15–70% of the total phase emissions, while the remaining emissions were due to construction materials. In the operation phase, emissions were mainly generated by vehicle movement. Street lighting also contributed to emissions during the operation phase. On the other hand, the irrigation of planted trees along the road had a very low impact on GHG emissions, and carbon sequestration by these trees had a negligible effect in terms of acting as a carbon sink. The results obtained from this study were compared with other cases reported in the literature.

Highlights

  • Global greenhouse gas (GHG) emissions are generated by different regional dynamics over time

  • According to the International Energy Agency (IEA), transport accounted for approximately 8 Gt CO2 in 2016, which marks a 71% increase from 1990 [2]

  • Several studies were conducted to assess carbon footprint emissions produced by road projects

Read more

Summary

Introduction

Global greenhouse gas (GHG) emissions are generated by different regional dynamics over time. According to the International Energy Agency (IEA), transport accounted for approximately 8 Gt CO2 in 2016 (the equivalent of one-quarter of the total global GHG emissions), which marks a 71% increase from 1990 [2]. The transport sector was responsible for the second-largest amount of GHG emissions in 2016, following the electricity and heat generation sector [2]. 74% of transport sector emissions were attributed to road transport [3]. Road transport will continue to grow, with a projected global increase of 60% in the total length of roads by 2050 over that in 2010 [4]

Objectives
Methods
Results
Conclusion
Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call