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BITRE | Waterline 44Crane time not worked (percent)—this is the time when a crane could not be usedfor any reason (operational or non-operational) as a percentage of the total timeallocated to a crane.Ship rate (containers per hour)—this indicator measures the combined stevedoringproductivity of capital and labour. It gives the stevedoring productivity per ship whilethe ship is being worked. It is computed as the crane rate times the crane intensitywhere crane intensity is (total number of allocated crane hours/elapsed labourtime).Throughput pbm (tonnes per berth metre squared)—this is the quantity of containerand non-container cargo which passes through the port container terminals andis measured in tonnes per berth metre squared. It is a measure of the density ofthe storage system and reflects the ability of the terminal container storage area totransfer containers from ship to shore and vice versa.Port interface cost index definitions as used in Chapter 3The port interface cost index is a measure of shore-based shipping costs or chargesfor containers moved through mainland capital city ports. These are called ‘shorebased’because they are that part of the charges paid by importers and exportersof containers which are directly related to the activity which occurs in the port andon the wharf. They do not include the total price for importing or exporting goodscarried in containers paid by customers to customs brokers and freight forwarders.The index is a measure of the movements in costs to users of waterfront and relatedservices and, therefore, whether the cost is increasing or decreasing. The waterfrontis defined as the interface between seaports and land transport, hence the term portinterface cost index.Stevedoring and port and related charges are estimated for a standard representativeship transferring an average number of containers. Also land transport and custom’sagent’s charges are estimated for a representative transport distance for land transportand a representative consignment for customs agents charges.The Port Interface Cost Index provides estimates in the changes in five major costelements by port for exports and imports. The five cost components covered are:(a) Ship based charges (b) Cargo-based charges (c) Stevedoring costs (d) Customsbrokers’ fees (e) road transport costs. The construction of the Port Interface CostIndex is a four stage task:Stage 1: involves the determination of the vessel sizes to represent all vessels ofinterest that are used to transport containerised cargo. Two vessel sizes are used torepresent all vessels of interest. These are: vessel size of gross tonnage equal to 17 215represents all vessels of sizes ranging from 15 000 to 20 000; and vessel size of grosstonnage equal to 37 394 represents all vessels of sizes ranging from 35 000 to 40 000.This size determination was calculated at the commencement of the Waterline seriesand is still used. These two ranges are selected to provide the standard representativeships used in the calculations.60