Editing Trolleybus (section)

===Comparison to motorbuses===
*Difficult to re-route{{snd}}When compared to [[Bus|motorbuses]], trolleybuses have greater difficulties with temporary or permanent re-routings, wiring for which is not usually readily available outside of downtown areas where the buses may be re-routed via adjacent business area streets where other trolleybus routes operate. This problem was highlighted in Vancouver in July 2008,<ref>{{cite news |title=Power in downtown Vancouver won't be fully restored until Tuesday |url=http://www.cbc.ca/news/canada/british-columbia/power-in-downtown-vancouver-won-t-be-fully-restored-until-tuesday-1.739479 |agency=CBC News |date=14 July 2008}} Other reports stated that the (electrical) explosion did not affect power supply to the trolleybuses (only implied by this article).</ref> when an explosion closed several roads in the city's downtown core. Because of the closure, trolleys were forced to detour several miles off their route in order to stay on the wires, leaving major portions of their routes not in service and off-schedule.
*Aesthetics{{snd}}The jumble of [[overhead line|overhead wires]] may be seen as unsightly.<ref>{{cite web|author=Ashley Bruce |url=http://www.tbus.org.uk/overhead.htm |title=Overhead |publisher=Tbus.org.uk |access-date=29 November 2010}}</ref> Intersections often have a "webbed ceiling" appearance, due to multiple crossing and converging sets of trolley wires.
*Dewirements{{snd}}[[Trolley pole]]s sometimes come off the wire. Dewirements are relatively rare in modern systems with well-maintained overhead wires, hangers, fittings and contact shoes. Trolleybuses are equipped with special insulated pole ropes which drivers use to reconnect the trolley poles with the overhead wires. When approaching switches, trolleybuses usually must decelerate in order to avoid dewiring, and this deceleration can potentially add slightly to traffic congestion. In 1998, a [[1998 Shenyang trolleybus electrocution accident|dewirement in Shenyang]] on poorly maintained infrastructure killed 5 people and ultimately led to the destruction of the trolleybus network.<ref>{{Cite web|title=沈阳1999年"电改汽"的真正原因_沈阳公交网|url=http://www.shenyangbus.com/a/gjls/2010/0614/255.html|access-date=2 September 2021|website=www.shenyangbus.com}}</ref>
*Unable to overtake other trolleybuses{{snd}}Trolleybuses cannot overtake one another in regular service unless two separate sets of wires with a switch are provided or the vehicles are equipped with off-wire capability, with the latter an increasingly common feature of new trolleybuses.
*Higher capital cost of equipment{{snd}}Trolleybuses are often long-lived equipment, with limited market demand. This generally leads to higher prices relative to [[Internal combustion engine|internal combustion]] buses. The long equipment life may also complicate upgrades.
*More training required{{snd}}Drivers must learn how to prevent dewiring, slowing down at turns and through switches in the overhead wire system, for example.<ref>{{cite web|title=Electric Trolley Bus Fact Sheet|url=http://www.seattle.gov/transportation/docs/ElectricTrolleyBusFactSheet0110.pdf|publisher=Seattle Department of Transportation|access-date=29 March 2012|url-status=dead|archive-url=https://web.archive.org/web/20170217035300/http://www.seattle.gov/transportation/docs/ElectricTrolleyBusFactSheet0110.pdf|archive-date=17 February 2017}}</ref>
*Overhead wires create obstruction{{snd}}Trolleybus systems employ overhead wires above the roads, often shared with other vehicles. The wires can restrict tall motor vehicles such as delivery trucks ("[[Truck|lorries]]") and double decker buses from using or crossing roads fitted with overhead wires, as such vehicles would hit the wires or pass dangerously close to them, risking damage and [[Electric arc|dangerous electrical faults]]. The wires also may impede positioning of overhead signage and create a hazard to activities such as road repairs using tall excavators or piling rigs, use of scaffolding, etc.