Editing Seat belt (section)

====Disadvantages====
Automatic belt systems generally offer inferior occupant crash protection.<ref>{{cite news |agency=Associated Press |title=Chrysler Doubts Air-Bag Claims |date=1977-09-30 |url=https://news.google.com/newspapers?id=apAjAAAAIBAJ&pg=896,3611827&hl=en |work =The Montreal Gazette |access-date=2010-09-25}}</ref><ref name="Abeles">{{cite thesis |title=The Ability of Automakers to Introduce a Costly, Regulated New Technology: A Case Study of Automotive Airbags in the U.S. Light-Duty Vehicle Market |type=Master's Thesis |year=1998 |first=Ethan |last=Abeles |url=http://pubs.its.ucdavis.edu/publication_detail.php?id=175 |access-date=2010-09-25 |archive-url=https://web.archive.org/web/20100612195455/http://pubs.its.ucdavis.edu/publication_detail.php?id=175 |url-status=dead |archive-date=2010-06-12}}</ref> In systems with belts attached to the door rather than a sturdier fixed portion of the vehicle body, a crash that causes the vehicle door to open leaves the occupant without belt protection. In such a scenario, the occupant may be thrown from the vehicle and suffer greater injury or death.<ref name=Abeles/>

Because many automatic belt system designs compliant with the U.S. passive-restraint mandate did not meet the anchorage requirements of [[Canada]] (CMVSS 210)—which were not weakened to accommodate automatic belts—vehicle models that had been eligible for easy importation in either direction across the U.S.-Canada border when equipped with manual belts became ineligible for importation in either direction once the U.S. variants obtained automatic belts and the Canadian versions retained manual belts, although some Canadian versions also had automatic seat belts. Two particular models affected were the [[Dodge Spirit]] and [[Plymouth Acclaim]].<ref>{{cite web |url= http://www.tc.gc.ca/media/documents/roadsafety/vafus.pdf |archive-url = https://web.archive.org/web/20100821083457/http://www.tc.gc.ca/media/documents/roadsafety/vafus.pdf |archive-date = 2010-08-21 | title= List of Vehicles Admissible From the United States |publisher= Transport Canada |date=2010-07-22 | id = CL9203(E) |pages = 2, 5, 8 }}</ref>

Automatic belt systems also present several operational disadvantages. Motorists who would normally wear seat belts must still fasten the manual lap belt, thus rendering redundant the automation of the shoulder belt. Those who do not fasten the lap belt wind up inadequately protected only by the shoulder belt. In a crash, without a lap belt, such a vehicle occupant is likely to "submarine" (be thrown forward under the shoulder belt) and be seriously injured.{{Citation needed |date=March 2019}} Motorized or door-affixed shoulder belts hinder access to the vehicle, making it difficult to enter and exit—particularly if the occupant is carrying items such as a box or a purse. Vehicle owners tend to disconnect the motorized or door-affixed shoulder belt to relieve the nuisance when entering and exiting the vehicle, leaving only a lap belt for crash protection.{{Citation needed |date=March 2019}} Also, many automatic seat belt systems are incompatible with child safety seats, or only compatible with special modifications.