
There are some studies that have found that traffic cameras slow down traffic, increase wait times, and fuel an increase in rear-end accidents.

While some studies have found negative results from the traffic cameras, there are others, such as one that was funded by the Insurance Institute for Highway Safety, which found different results; that they allegedly reduced collisions.
However, it appears that a growing number of people are starting to question the efficiency of the cameras; considering the resources that go into maintaining and replacing them etc. As well as the billions of dollars in funding that they are helping to collect for the state.
Are they causing more harm than good?
There have been several attempts to ban red-light traffic cameras and to have them removed from various jurisdictions, some public officials have even including it as a campaign promise to voters. But many efforts thus far have failed. However, they did have some success recently in Arizona a few months ago, after House legislators there decided to pass a bill to get rid of traffic cameras; sending it to the Senate for further approval.
The Senate in Texas has also recently voted to ban the use of traffic cameras statewide. One Senator from Texas, Sen. Don Huffines, previously declared that he wants the state to reimburse the victims of these traffic cameras and he wants the entire program turned off; he's made multiple attempts to try and see that happen.
Regardless of the growing number of critics who are trying to make efforts to have the cameras removed, there are still a great deal of law enforcement personnel and other public officials etc, who maintain that there is a need to continue using them across the country.

One critic of the cameras, an engineer from Sweden, Mats Jarlstrom, who now resides in Oregon, decided to conduct his own investigation on the cameras and he was slapped with a fine from the state for having engaged in unlicensed practice of engineering because he isn't a licensed professional in the eyes of the state of Oregon.
Jarlstrom launched his mission several years ago and he's been looking to prove that the cameras are setting drivers up for tickets; they're rigged against the laws of nature, he says.
He's already been fined hundreds of dollars by the state and been under investigation, simply for trying to point out what he believes is a problem that they should be concerned with correcting.
He fought back, and won.
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Sources:
http://time.com/3643077/red-light-cams-rear-end-collisions-chicago/
https://globalnews.ca/news/2853066/turning-off-red-light-cameras-can-be-deadly-study/
http://abcnews.go.com/US/red-light-camera-backlash-cameras-causing-accidents/story?id=13925887
http://www.orlandosentinel.com/news/politics/os-red-light-cameras-crashes-20170106-story.html
https://www.azcentral.com/story/news/politics/legislature/2017/02/21/arizona-lawmaker-travis-grantham-wants-get-rid-photo-radar/98199096/
http://tucson.com/news/local/no-more-tickets-from-tucson-s-red-light-cameras-radar/article_c4b350cf-2e9a-59ef-b644-ce83fca30896.html
https://www.vice.com/en_ca/article/5gkgxn/the-shady-municipal-business-of-traffic-cams
http://www.phoenixnewtimes.com/news/arizona-debates-red-light-cameras-tools-that-save-lives-or-police-state-tactics-9114403
http://kxan.com/2017/09/11/abilene-mayor-we-did-red-light-cameras-the-right-way/
https://www.usnews.com/news/best-states/texas/articles/2017-03-29/texas-senate-votes-to-ban-red-light-cameras-statewide
http://koin.com/2016/08/10/are-red-light-cameras-rigged-against-laws-of-nature/
https://www.washingtonpost.com/news/morning-mix/wp/2017/12/08/criticizing-red-light-cameras-is-not-a-punishable-offense-oregon-concedes/?utm_term=.49814732d3b0
https://www.forbes.com/sites/instituteforjustice/2017/04/28/do-you-need-a-license-in-engineering-to-criticize-red-light-cameras-oregon-says-yes/