As far as I can see, one end is at the junction of the M1 and M6, and the other is at Walton Avenue in Felixstowe where it meets the A45.
it starts at holland
Very
There is no specific term or concept that Europeans commonly refer to as "a14." It is possible that "a14" refers to something specific in a particular context, but without further information, it is not possible to provide a more specific answer.
yes
a14
It is a 14 sided polygon
190 miles taking this route:Take M42(N), from Bromsgrove, to M6 LONDON at J7A.Take M6 to A14 FELIXSTOWE at the END of the M6 motorway.Take A14 to A11 NORWICH at J38.Take A11 to A47 GREAT YARMOUTH at the junction outside of Norwich.Take A47 to Great Yarmouth.
Birmingham, West Midlands to Cambridge, Cambridgeshire is 95 miles taking this route:Take M6 LONDON, from Birmingham, to A14 FELIXSTOWE.Take A14 to Cambridge.
2160 degrees
No
c23
370 km taking this route:Follow A4 MILANO, from Venezia, to A13 BOLOGNA at the junction near Padua.Take A13 to A14 ANCONA.Take A14 to Ancona.