Dynamic speed choice in bulk shipping

Dynamic speed choice in real-life seaway and market conditions, when subject to technical and contractual constraints, is a highly complex problem. In this paper, we investigate dynamic speed choice using a large dataset of average sailing speeds for nearly 18,000 individual voyages as calculated from Automated Identification System (AIS) data. Using a set of multiple regression models, we expand the traditional analysis of speed determinants, from only macroeconomic variables to also include proxies for organizational constraints, operator quality, trading pattern, loading conditions, technical constraints and ship-specific variables. We find that owners do not appear to adjust vessel speeds based on freight market conditions and fuel prices, as argued in classical maritime economic theory. Instead, vessel-specific variables such as age and design speed, as well as operational factors such as loading conditions, show some explanatory power. The poor model fit may be due to factors outside our model, such as weather conditions and contractual limitations. From a policy point of view, the results actually suggest that higher fuel prices do not contribute to a reduction in vessel speeds and emissions.

[1]  Christos A. Kontovas,et al.  The link between economy and environment in the post-crisis era: lessons learned from slow steaming , 2011 .

[2]  Ari Vepsäläinen,et al.  Economies of Speed in Sea Transportation , 1994 .

[3]  Michael Beenstock,et al.  AN ECONOMETRIC MODEL OF THE WORLD TANKER MARKET , 1989 .

[4]  Christos A. Kontovas,et al.  Reduction of emissions along the maritime intermodal container chain: operational models and policies , 2011 .

[5]  Jonas Andersson,et al.  Missing in Action? Speed Optimization and Slow Steaming in Maritime Shipping , 2015 .

[6]  T. Notteboom,et al.  The effect of high fuel costs on liner service configuration in container shipping , 2009 .

[7]  Gunnar S. Eskeland,et al.  Low carbon maritime transport: How speed, size and slenderness amounts to substantial capital energy substitution , 2015 .

[8]  Piet Rietveld,et al.  Freight Prices, Fuel Prices, and Speed , 2012 .

[9]  Pierre Cariou,et al.  Is slow steaming a sustainable means of reducing CO2 emissions from container shipping , 2011 .

[10]  D. Ronen,et al.  The effect of oil price on containership speed and fleet size , 2011, J. Oper. Res. Soc..

[11]  James J. Corbett,et al.  The effectiveness and costs of speed reductions on emissions from international shipping , 2009 .

[12]  Pierre Cariou,et al.  Do Port State Control Inspections Influence Flag- and Class-hopping Phenomena in Shipping? , 2011 .

[13]  David Ronen,et al.  The Effect of Oil Price on the Optimal Speed of Ships , 1982 .