Final answer:
Two types of vehicles with turn signals that do not automatically cancel are motorcycles and some older cars. Motorcycles lack the steering wheel mechanism that cancels signals in cars, and older vehicles may not have automatic canceling technology at all.
Step-by-step explanation:
Two types of vehicles that have turn signals that do not automatically cancel are motorcycles and some older vehicles. Motorcycles often require the rider to manually cancel the turn signal after making a turn because the mechanism that cancels the signal in cars (which responds to the steering wheel) is not present. Additionally, older vehicles, particularly those manufactured before the advent of self-cancelling turn signal technology, may require the driver to manually switch off the turn signals after completing a turn. Newer car models typically have an automatic turn signal canceling feature that is triggered once the steering wheel is returned to the neutral position after making a turn.
Many motorcycles have turn signals that do not automatically cancel after completing a turn. This feature allows riders to indicate their intention to turn or change lanes for as long as necessary. Riders must manually turn off the signal after completing the maneuver to ensure that the signal does not stay on indefinitely.
Bicycles:
Some bicycles also have turn signals that do not automatically cancel. These signals are typically operated by a push-button switch located on the handlebars. The cyclist must manually turn off the signal after completing a turn or lane change.