Original sentence: As a warning, the "don't walk" or hand signals begin to blink when the transition to "don't walk" is imminent.At crossings controlled by signals, the most common variety is arranged like this: At each end of a crosswalk, the poles which hold the traffic lights also have white "walk" and Portland Orange "don't walk" signs.Most also incorporate a button on the near side to allow a pedestrian to notify the system that a pedestrian is waiting for a "walk" signal, which may or may not produce the desired signal more quickly — although some systems on busy roadways will increase motor traffic flow by not producing a "walk" signal at all unless and until such a button is pushed.On pedestrian signals displaying text, "don't walk" is spelled without an apostrophe so that it fits easily on the sign.Some signals continue flashing the hand/"don't walk" phase during the yellow light, and go steady at red.Sometimes the "walk" signal does not come on in a steady pattern; it will sometimes blink/flash on and off instead to warn pedestrians to cross the street with caution due to the possibility of a turning vehicle
Edited sentence: As a warning, the "" or hand signals begin to blink when the transition to "" is imminent.At crossings controlled by signals, the most common variety is arranged like this: At each end of a crosswalk, the poles which hold the traffic lights also have white "" and Portland Orange "" signs.Most also incorporate a button on the near side to allow a pedestrian to notify the system that a pedestrian is waiting for a "" signal, which may or may not produce the desired signal more quickly — although some systems on busy roadways will increase motor traffic flow by not producing a "" signal at all unless and until such a button is pushed.On pedestrian signals displaying text, """" is spelled without an apostrophe so that it fits easily on the sign.Some signals continue flashing the hand/"" phase during the yellow light, and go steady at red.Sometimes the "" signal does not come on in a steady pattern; it will sometimes blink/flash on and off instead to warn pedestrians to cross the street with caution due to the possibility of a turning vehicle