 During summer, due to heat the speed can be reduced to 

In the Grand Duchy, the development of motorway projects had its beginnings in the late 1960s.The first sections made were the Kirchberg - Senningerberg sections of the A1 motorway and Pontpierre - Esch-sur-Alzette / Lallange sections of the A4 motorway.They were put into service in 1969, quickly followed by the A3 (Luxembourg - Dudelange) and A6 motorways towards Arlon.