Road Construction in Poland

The dataset comprises the selected information on road construction contracts ordered in Poland in 2014-2017. All of them were executed under public procurement law. However, not all road construction orders from that time are included in the database due to the unavailability of data. There are the following types of data: label of contracts, type of works (construction of a new road or modernization of an existing one), type of road (highway, express road, national road, voivodeship road, county road), location of the road by voivodeship, type of order (order of design, then a construction ordered separately - marked as "design then build"; design and the construction jointly ordered - marked as "design and build"), the price for design (in PLN), price for construction works (in PLN), total price for design and construction works, lengths of the section of the road, total price per 1 km of the road. In the case of "design and build" orders separate prices for the design, and for the construction works are not given ("n/a" are placed there). Data were collected to verify if the unit price for 1 km of road is higher when the order type is "design and build".本数据集收录了2014至2017年间波兰境内公开招标的公路建设合同精选信息。所有合同均严格遵循波兰公共采购法执行。但受限于部分数据不可获取，该时段内并非所有公路建设招标项目均被纳入本数据库。数据集涵盖以下类别数据：合同标识、工程类型（含新建道路或既有道路升级改造两类）、道路等级（包括高速公路、快速路、国道、省道、县道）、道路所在波兰省域位置、招标模式（分为两类：一是"design then build"，即先单独招标设计服务，再单独招标施工工程；二是"design and build"，即设计与施工一并招标）、设计费用（单位：波兰兹罗提（PLN））、施工工程费用（单位：波兰兹罗提（PLN））、设计与施工总费用、路段长度、每公里道路总造价。针对"design and build"类招标项目，不单独列出设计与施工的分项费用，此类字段将以"n/a"填充。本次数据采集的目的为验证：当招标模式为"design and build"时，道路每公里单位造价是否更高。