RUBBERNECK
rubberneck, rubbernecker
(noun) a person who stares inquisitively
sightseer, excursionist, tripper, rubberneck
(noun) a tourist who is visiting sights of interest
rubberneck
(verb) strain to watch; stare curiously; “The cars slowed down and the drivers rubbernecked after the accident”
Source: WordNet® 3.1
Etymology
Coined in the sense of "tourist" in the United States in the late 19th century. A favored Americanism of H.L. Mencken.
Noun
rubberneck (plural rubbernecks)
Someone who engages in rubbernecking, or turning and staring.
Synonym: rubbernecker
(US, obsolete) A tourist.
Someone or something with a flexible neck.
Verb
rubberneck (third-person singular simple present rubbernecks, present participle rubbernecking, simple past and past participle rubbernecked)
To watch by craning the neck (as though it were made of rubber), especially if the observer and observed are in motion relative to each other.
Source: Wiktionary