Input-Edit Template Series
Function
This is another method of widening lanes or causing templates to
change: direct template-to-template transitioning. Using
this command, you specify the station where one template "ends" and the
station where another template "begins", and the program
auto-transitions between templates. For the transition to work
optimally, the templates should share the same IDs. If the
templates are distinct with separate, unrelated IDs, then by ending
template1 at station 500 (for example) and starting template2 at
station 500.01, a very abrupt transition can be accomplished. For
modifying templates, the Template Series method is an alternative to
both the Template Transition method and to a third method of using
Template Point Profiles and
Template Point Centerlines, where a template ID "follows" a particular
centerline
and profile. One advantage of the Template Series approach is
that
it can be used to link different templates together, like non-curb and
curb
templates, as shown here in plan view:
For the above example, Template 1 applies from station 0+00 to 0+30,
then
transitions to Template 2 at 1+00, which itself transitions to Template
3
(still no right-side curb), which ends at 1+05. There, Template 4
starts
with a curb replacing a standard EOP/Ditch combination on the right
side. So Template 4 would be set to begin at 1+05.1, a short distance
past
1+05. This template transitions into Template 5 at station 2+05. You
do not need to enter start and ending templates at station 0+00 or
after
station 2+05. Therefore, the dialog for this example might look
as
follows:
Note that you can run Process Road Design to review the design results
in
plan view, with entry of only the Design Template/Series, the Profile
and
the Centerline (items 1, 2 and 4 within Process Road Design). You
do
not need existing cross sections to use Process Road Design. If
you
process at an interval such as 10 over any desired station range, you
can
output the Template Polylines and verify the result in plan view.
If
no sections are found, the program will process from edge of shoulder
left
to edge of shoulder right, and omit cut and fill slopes. With the
correct
templates, this would reproduce the plan view shown above.
Input-Edit Template Series is also an effective way to accomplish
superelevation,
and even simultaneous superelevation and lane widening. Consider
the
"stages" of pivoting into superelevation of 3%. The first template
might be called "Normal Crown" (the lower template).
The
second template might be called "Reverse Crown" (+2% cross slope).
The
third template might be called "Full Super" and would be the +3%
template. You need the second template because you need to "restrain"
the
left-hand
side of the road from pivoting until the continuous +2% cross slope is
reached. If you only used the "Normal Crown" template, say, at station
4+00
and
then the "Full Super" template at station 6+00, then at station 5+00,
where
1/2 of the transition occurs, the left side cross slope would be -2.5%
(transitioning
halfway). In reality, the left side should not pivot until
station
5+60. If the rate of pivoting is less from normal crown to flat
outside
lane, and the rate changes after that point, then you would need a
fourth
template to direct how the road transitions to full superelevation.
Prompts
Pulldown Menu Location: Roads
Keyboard Command: tplseries
Prerequisite: Template Files
File Name: \lsp\tplmake.arx