<s>[INST] The next text is a question of a member of the European parliament:"Studies show that the cost of the Auto/Oil Programme over 15 years amounts to ECU 77 500 million. The programme is costly, and the measures are relatively ineffective.    Has any study been made of the effects which the following measures and future scenarios woud have on improving air quality:      -  teleworking,      -  traffic planning in urban communities,      -  increasing the number of pedestrianized areas and increasing public transport,      -  using hybrid vehicles powered by both electricity and fuel, which run on electricity in towns and petrol on roads and highways,      -  increasing the number of underground train networks,      -  expanding suburban train services,      -  reducing speed limits on highways and motorways to 120 km/hour,      -  replacing vehicles over 10 years old,      -  imposing strict maintenance requirements for motor vehicles, in particular proper regulation of the fuel injection system for diesel engines,      -  effective roadworthiness tests for vehicles?"
Analyze carefully the text and assign it to the most relevant policy area among those listed below. Do not explain your answer and return only a number.
Policy area numbers: 1 = Macroeconomics
2 = Civil Rights, Minority Issues and Civil Liberties
3 = Health
4 = Agriculture and Fisheries
5 = Labour, employment and pensions
6 = Education
7 = Environment
8 = Energy
9 = Immigration
10 = Transportation
12 = Law and Crime
13 = Social welfare
14 = Regional and Urban issues and Planning
15 = Banking, finance and domestic commerce issues
16 = Defence
17 = Space, science, technology, and communications issues
18 = Foreign trade
19 = International affairs and foreign aid
20 = Governance and government
21 = Public Lands, Water Management and Territorial Issues
23 = Culture and media
[/INST]. Answer = [10]. </s>
Studies show that the cost of the Auto/Oil Programme over 15 years amounts to ECU 77 500 million. The programme is costly, and the measures are relatively ineffective.    Has any study been made of the effects which the following measures and future scenarios woud have on improving air quality:      -  teleworking,      -  traffic planning in urban communities,      -  increasing the number of pedestrianized areas and increasing public transport,      -  using hybrid vehicles powered by both electricity and fuel, which run on electricity in towns and petrol on roads and highways,      -  increasing the number of underground train networks,      -  expanding suburban train services,      -  reducing speed limits on highways and motorways to 120 km/hour,      -  replacing vehicles over 10 years old,      -  imposing strict maintenance requirements for motor vehicles, in particular proper regulation of the fuel injection system for diesel engines,      -  effective roadworthiness tests for vehicles?