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For any question on data and metadata, please contact: Eurostat user support |
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1.1. Contact organisation | Statistics Portugal (INE) - National Statistical Institute |
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1.2. Contact organisation unit | Statistics Portugal - Economic Statistics - Sectoral Business Statistics Unit |
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1.5. Contact mail address | Av. António José de Almeida Portugal |
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2.1. Metadata last certified | 10/07/2023 | ||
2.2. Metadata last posted | 10/07/2023 | ||
2.3. Metadata last update | 10/07/2023 |
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3.1. Data description | |||
Road freight data collection consists of three datasets with quarterly periodicity: 1. Vehicle related variables dataset for a sample of road good motor vehicles that contains indication about the type and age of the vehicle, the economic activity of the owner of the vehicle, the total kilometres loaded or empty and the weighting factors to be applied; |
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3.2. Classification system | |||
Statistics on carriage of goods by road apply the following statistical classifications:
The optional variable type of cargo follows the Classification of Cargo Types of UNECE (United Nations, Economic Commission for Europe - codes for types of cargo, packages and packaging materials, Recommendation 21 adopted by the Working Party on Facilitation of International Trade Procedures, Geneva, March 1986). |
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3.3. Coverage - sector | |||
The Road Freight Transport Survey covers the movement of goods made by vehicles - trucks and road tractors - that are registered in Portugal. The movement includes national and internacional transport as well as transport made by own account and for hire and reward. Out of the scope of the survey are the following vehicles:
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3.4. Statistical concepts and definitions | |||
The main concepts used in Road freight statistics are the following, more details can be found in the Road freight transport methodology manual : A goods road motor vehicle is any single road transport vehicle (lorry), or combination of road vehicles, namely road train (lorry with trailer) or articulated vehicle (road tractor with semi-trailer), designed to carry goods
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3.5. Statistical unit | |||
Goods road transport vehicle with load capacity of more than 3,5 tonnes (lorries) or maximum permissible laden weight of more than 6 tonnes (road tractors); |
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3.6. Statistical population | |||
Goods road transport vehicle with load capacity of more than 3,5 tonnes (lorries) or maximum permissible laden weight of more than 6 tonnes (road tractors) registered in Portugal; |
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3.7. Reference area | |||
Movement is only to/from mainland Portugal; Autonomous regions of Azores and Madeira movements are not included; |
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3.8. Coverage - Time | |||
Road freight transport survey is collected since 1987. |
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3.9. Base period | |||
Not applicable. |
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Data are collected in tonnes, tonne-kilometres, vehicle-kilometres and in number of journeys (journey data) or in number of basic transport operations (BTO (goods related data)). |
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The road data are collected on a quarterly basis and are reported to Eurostat five months after the end of the reference period. |
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6.1. Institutional Mandate - legal acts and other agreements | |||
National level: European level: |
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6.2. Institutional Mandate - data sharing | |||
Eurostat submits annually semi-aggregated data (data exchange tables, see Commission Regulation (EU) No 202/2010 amending the Commission Regulation (EC) 6/2003) back to the reporting countries so that they can compile the total road freight transport on their national territories, including the operations by national hauliers and also those of all other reporting countries. These data exchange tables include more detailed breakdowns than the publicly available tables. They also include, for each value, the information on the number of observations that the estimates are based on. In this way, the reporting countries can estimate the reliability of results that they aggregate from the data exchange tables. |
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7.1. Confidentiality - policy | |||
National level: European level:
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7.2. Confidentiality - data treatment | |||
The vehicle registration number (licence plate) of the vehicle is coded. |
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8.1. Release calendar | |||
A release calendar is available on the Statistics Portugal website (https://www.ine.pt/xportal/xmain?xpgid=ine_main&xpid=INE&xlang=en). The quarterly data on road freight transports is available within 3 months after the end of the respective quarter. |
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8.2. Release calendar access | |||
https://www.ine.pt/xportal/xmain?xpid=INE&xpgid=ine_dispinfest |
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8.3. Release policy - user access | |||
Data is made available for all users at the same time. On the dissemination date, a press release is made and publicized on Statistics Portugal website. Several indicators are updated and available for public consultation on the website. |
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Quarterly and annually dissemination; |
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10.1. Dissemination format - News release | |||
There is a press release on every moment of dissemination of information. |
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10.2. Dissemination format - Publications | |||
A publication is made available within 11 months after the end of reference year. The publication contains data on freigth and passenger transport for every mode of transport: rail, road, maritime, inland waterways and air transport. Some tables with results are also disseminated with the publication. The publication is in Portuguese (the introduction is in both Portuguese and English). |
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10.3. Dissemination format - online database | |||
On Statistics Portugal website are available some indicators from road freight transport survey. See here. |
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10.4. Dissemination format - microdata access | |||
Not applicable. |
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10.5. Dissemination format - other | |||
Not applicable. |
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10.6. Documentation on methodology | |||
National characteristics of surveys, conducted in the reporting countries in 2017, were published in Methodologies used in surveys of road freight transport in Member States, EFTA and Candidate Countries. This latter publication also contains data on response rates, vehicle registers' quality, sampling rates and statistical errors in surveys carried out in 2016. A metodological document of the survey is also available in the Statistics Portugal Integrated Metadata System (http://smi.ine.pt). The information is only available for download in portuguese. |
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10.7. Quality management - documentation | |||
Not applicable. |
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11.1. Quality assurance | |||
There are flags in the online survey to avoid missing values on key variables and to alert to some incoherences in values of one variable or in values between variables before submission. The submitted surveys are verified and a series of checks are done to ensure data quality. If needed, respondents are contacted to provide details on their journeys and correct data if necessary. |
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11.2. Quality management - assessment | |||
Not applicable. |
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12.1. Relevance - User Needs | |||
DG MOVE is one of the main users which needs data for policy decisions. Contact with users is also regular through Statistics Portugal dissemination service: this activity concerns, in addition to the previous mentioned users, other categories of users such as national administrations, enterprises, researchers, universities, citizens, journalists and so on. |
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12.2. Relevance - User Satisfaction | |||
Not applicable. |
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12.3. Completeness | |||
Data are complete according to the requirements of the Regulation. |
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13.1. Accuracy - overall | |||
The overall accuracy is considered to be good given the assessment of data processing. |
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13.2. Sampling error | |||
The precision of an estimator is given by its coeficient of variation. This coeficient can be consulted on the annual publication of transports (see chapter 9 for more details). |
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13.3. Non-sampling error | |||
No estimates of measurement errors are available. However, some measuring errors may occur as a result of codification errors by respondents. A large share of so-called “unknown codes” instead of specific codes for type of goods, region of loading/unloading is also a factor which will reduce the accuracy of road transport statistics outside the European Union. |
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14.1. Timeliness | |||
Data are normally updated once per quarter. If new annual data (all four quarters of a calendar year) have become available, the annual datasets are also updated together with the quarterly datasets. |
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14.2. Punctuality | |||
Road freight data are transmitted to Eurostat within 5 months after the end of the reference period, as specified in the Regulation (EU) 70/2012. |
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15.1. Comparability - geographical | |||
Geographical comparability is obtained via the application of common concepts and validation rules. The harmonised interpretation of the methodology is enhanced by the organisation of regular meeting of the Working Group, where all participating countries are represented. |
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15.2. Comparability - over time | |||
There might be a break in time series for certain variables in 2008, due to the change in the nomenclature applied for the classification of goods (NST 2007). |
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15.3. Coherence - cross domain | |||
Not applicable. |
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15.4. Coherence - internal | |||
The quality checks include intra-dataset checks and inter-datasets checks. These quality checks detect data that could possibly be in error. Some errors are corrected before publications. Other errors, which require further investigations, are corrected later. |
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Road Freight Transport Survey is a very consuming in terms of filling the survey. Some measures were done in order to reduce the time: some vehicle related variables are already filled and only need confirmation from the respondent. Also, the online questionnaire have some validation rules in order to minimize the need to correct data. |
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17.1. Data revision - policy | |||
Data is revised in order to include some late responses and corrections made by the respondents. |
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17.2. Data revision - practice | |||
Data from previous quarter is revised in order to include some late responses and corrections made by the respondents. |
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18.1. Source data | |||
Sampling register used for the survey Name of register: Heavy goods road vehicle file Name of organisation who maintains the register: National Organisations:
Frequency of update: Quarterly concerning the survey feedback, annually concerning the 2 external sources Frequency of access to draw the samples: Once a quarter Arrangements for accessing the register: Each year, IMT provides the file containing the vehicles licensed to transport activities and IRN provides the file containing the identification (name and address) of the owners or users (these last one only for registers changed in the current year). Information obtained from the register: Vehicle registration, 1st year of the vehicle registration, maximum permissible laden weight, load capacity, number of axles, category of the vehicle, type of transport, identification and NACE of the owner, auxiliary information about some leasing contracts. Used in stratification: NUTS II of the address of the owners (Mainland regions: Norte, Centro, Lisboa, Alentejo and Algarve), Category of the vehicle (Lorry or Road tractor), Gross weight class (5 for lorries and 2 for tractors), Type of transport (Own Account, Hire or Reward). Procedure for reminders: The first reminder goes out 3 weeks after the end of the month under observation, the second reminder goes out three weeks after the first one and the last reminder goes out only for selected specific cases. The response rate seems to be adequate (about 90-95 % in provisional data). |
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18.2. Frequency of data collection | |||
Data collection is continuous. |
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18.3. Data collection | |||
Sampling methodology
Statistical unit: Tractive vehicle Types of units excluded: All vehicles with maximum permissible laden weight equal or inferior to 3 500 kg, vehicles not used for the transport of goods, such as agricultural and military vehicles, fire engines and special transport vehicles. Time unit: 1 week Time unit of quarter: All (13 weeks) Stratification: Two stratum of ‘gross weight class’ were merged: 19 001kg - 22 000kg and 22 000kg - 26 000Kg into 19 001 Kg - 26 000 Kg. The sample is stratified according to the following variables:
Recording of weight of goods: Gross weight of goods is collected, i.e. containers swap bodies and pallets are excluded. Recording of journey data sent to Eurostat: Single stop: If in the same journey, more than one goods commodity is carried, we consider that journey as type 2. Multi stop: Multi-stop journeys are coded by consignments. This type of journey is considered when there is more than one goods commodity being carried or several stops during the journey. When the answer implies several stops, the journey is transformed into type 1 journeys; if the vehicle becomes empty, a new road freight transport operation is considered Collection/delivery: This type of journey is considered whenever there is a collection/delivery of goods with an unrecorded number of stops with short distances separating them. When retrieving data there are often the following situations:
Estimation of maximum permissible laden weight: Maximum permissible laden weight is estimated by adding the gross weight of the vehicle and the gross weight of the trailers (or semi-trailer) used. Calculation of weighting factors: Weighting factor = h = stratum Nh = total number of vehicles adjusted for strata changes and out-of-scope vehicles nh = number of usable responses (vehicles with activity + vehicles without activity) Non response: only effective responses are considered. Partial and non-responses are not treated. Wrong information in sample register(s): the information is corrected in the sampling frame. Vehicles without activity during the sampled period (due to sickness, repair, lack of work etc): are considered as effective responses. Post-stratification and sampling frame adjustment is used. Collection data is used to correct strata variables of sample units and adjust, in the same proportion, the distribution of total number of vehicles by strata. The out of scope vehicles are also eliminated from the sampling frame. Total number of vehicles is adjusted as well.
Optional variables covered: A1. Vehicle-related variables:
A2. Journey-related variables:
A3. Goods-related variables:
Additional variables collected compared to the legal requirements: None |
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18.4. Data validation | |||
National level : Data is validated through the online questionnaire to avoid errors in database. Data reported is also checked and suspicious values are flagged and reported to the respondent to obtain a justification on correction. From Eurostat : Since 1999, micro-data from the reporting countries have to be submitted according to Commission Regulation 2163/2001. The data are then checked and validated by EUROSTAT (verification of many different codes used (NUTS 3, numeric or alphabetic variables) correctness of linked questionnaires in the different dataset, etc…). Detected errors are then reported back to the data sender with the request for correction, this is an iterative process until at least 99.5% of all data records are validated and loaded in the database. |
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18.5. Data compilation | |||
Data is compiled through informatical procedure. The transformed datasets are also checked to find inconsistencies in compiling. |
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18.6. Adjustment | |||
Road freight data are not seasonally adjusted. |
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Not applicable. |
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