With a one - way length of approximately 22 km , route M13 is the longest trolleybus route in western Europe .
Route M13 was extended from Aversa to Teverola in December 2001 , and route M15 ( Naples -- Secondigliano ) was withdrawn at that time .
With a one - way length of approximately 22 km , Route M13 Route M13 is the longest trolleybus route in western Europe .
Route M13 was extended from Aversa to Teverola in December 2001 , and route M15 ( Naples -- Secondigliano ) was withdrawn at that time .