Why can't you...

[Pingbns]

why can't you install child seat on vechile seat that face the rear or side?
i Wouldn't do it of course

[Ashley_R]

Because the seats are not tested to perform in a crash at a right angle to the collision. There is no way to know how a seat will perfer because there is no standard for side impacts.

Also, generally the seats are MUCH too small to put a seat on.

[skaterbabscpst]

Because the manufacturers say so.

We do not know if this is because they tested it and it failed, or they haven't tested it and therefor cannot allow it.