Roadway Design Question and Answer Forum
Criteria
Question:
I have a project with a median barrier. Criteria is holding the proposed roadway cross
slope and tying this slope into the median barrier in lieu of utilizing the 0.04
slope that is required. What are my options if I want Criteria to process the standard
rollover rates at the inside paved shoulder section?
Roadway Standard Drawings 560.02
Answer:
The median barrier Criteria (mdnbw01.cri) can be processed with or without a shoulder
Criteria (shld01.cri). If only the template Criteria (tmplt01.cri) and the median barrier
Criteria are included in the input, then the super of the mainline is extended to the
inside paved shoulder section.
If a shoulder Criteria is inserted between the template and the median barrier Criteria,
then the standard rollover is applied
Since the width of paved shoulders can vary depending on the placement of the median
barrier, a non-standard shoulder width (considerably less than half of the median width)
and an override shoulder case statement MUST be included in the input for Criteria to
process this correctly.
For example;
Note the overriding "SHO# STANDARD CASE NUMBER" statement should always be set to "6"
(standard rollover for full depth paved shoulder >= 10'). When a non-standard shoulder
width (with the same paved shoulder width) is encountered by Criteria, the shoulder case
override statement forces the handling of rollover rates to the same standards as if the
shoulder width and paved shoulder width are greater than 10'. In the example above, Criteria
will draw both the 2.5' paved shoulder section and the remaining paved section to the toe
of the barrier on the same slope, standard rollover applied. A complete list of inside
shoulder rollover rates at a 6% lock, as processed by Criteria, is depicted below.
