In order to promote the internal market, a comprehensive Union type-approval system for tractors, their trailers and interchangeable towed equipment was established by Directive 2003/37/EC of the European Parliament and of the Council of 26 May 2003 on type-approval of agricultural or forestry tractors, their trailers and interchangeable towed machinery, together with their systems, components and separate technical units [3].
D’fhonn an margadh inmheánach a chur chun cinn, rinneadh córas cuimsitheach cineálcheadaithe Aontais le haghaidh tarracóirí, a leantóirí agus trealaimh idirmhalartaithe ar tarraingt a bhunú le Treoir 2003/37/CE ó Pharlaimint na hEorpa agus ón gComhairle an 26 Bealtaine 2003 maidir le cineálcheadú tarracóirí talmhaíochta nó foraoiseachta, a leantóirí agus innealra idirmhalartaithe ar tarraingt, mar aon lena gcórais, lena gcomhpháirteanna agus lena n-aonaid theicniúla ar leithligh [3].