...
Comparison of LRFD No Skew to 90 degree Skew:
The following is a table comparing the distribution width “E” between the two cases in LRFD, traffic parallel to span (no skew), and traffic perpendicular to span (90 degree skew). Looking at the skew effect column, it can be seen that once the span length is greater than or equal to 30 feet, then the skew effect disappears. However it should be noted that for spans greater than 24 feet more than one lane loaded will have to be considered for the skewed bridge. Even though the skew effect disappears, the design is not unconservative because more lanes loaded have to be considered.
...