Error(s) in re-building vignettes:
--- re-building 'intro_to_gtfs2gps.Rmd' using rmarkdown
Writing text files to C:\r_packages\pkgcheck\CRAN\gtfs2gps\tmp\RtmpoJeHS4\gtfsio1a3d06f0dcbc
  - Writing agency.txt
  - Writing calendar.txt
  - Writing routes.txt
  - Writing shapes.txt
  - Writing stop_times.txt
  - Writing stops.txt
  - Writing trips.txt
GTFS object successfully zipped to poa_small.zip
Unzipping and reading poa_small.zip
Unzipped the following files to C:\r_packages\pkgcheck\CRAN\gtfs2gps\tmp\RtmpoJeHS4/gtfsio:
  * agency.txt
  * calendar.txt
  * routes.txt
  * shapes.txt
  * stop_times.txt
  * stops.txt
  * trips.txt
Reading agency.txt
Reading calendar.txt
Reading routes.txt
Reading shapes.txt
Reading stop_times.txt
Reading stops.txt
Reading trips.txt
Converting shapes to sf objects
Processing the data

Attaching package: 'purrr'

The following object is masked from 'package:magrittr':

    set_names


Attaching package: 'data.table'

The following object is masked from 'package:purrr':

    transpose

Linking to GEOS 3.9.1, GDAL 3.3.2, PROJ 7.2.1; sf_use_s2() is TRUE
udunits database from C:/r_packages/pkgcheck/lib/units/share/udunits/udunits2.xml
50 'speed' values are NA for shapeid 'A141-1'.
3724 'speed' values are NA for shapeid 'T2-1'.
Some 'speed' values are NA in the returned data.
Unzipping and reading poa.zip
Unzipped the following files to C:\r_packages\pkgcheck\CRAN\gtfs2gps\tmp\RtmpoJeHS4/gtfsio:
  * agency.txt
  * calendar.txt
  * routes.txt
  * shapes.txt
  * stop_times.txt
  * stops.txt
  * trips.txt
Reading agency.txt
Reading calendar.txt
Reading routes.txt
Reading shapes.txt
Reading stop_times.txt
Reading stops.txt
Reading trips.txt
Converting shapes to sf objects
Processing the data
73 'speed' values are NA for shapeid '176-1'.
50 'speed' values are NA for shapeid 'A141-1'.
216 'speed' values are NA for shapeid 'R10-2'.
3724 'speed' values are NA for shapeid 'T2-1'.
Some 'speed' values are NA in the returned data.
Could not fetch https://latex.codecogs.com/png.image?%5Cdpi%7B110%7D&space;%5Cbg_white&space;Large%20Speed_i%20%3D%20%5Cfrac%7BS_%7Bi%2B1%7D-S_i%7D%7Bt_%7Bi%2B1%7D-t_i%7D
HttpExceptionRequest Request {
  host                 = "latex.codecogs.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/png.image"
  queryString          = "?%5Cdpi%7B110%7D&space;%5Cbg_white&space;Large%20Speed_i%20%3D%20%5Cfrac%7BS_%7Bi%2B1%7D-S_i%7D%7Bt_%7Bi%2B1%7D-t_i%7D"
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 (InternalException (HostCannotConnect "latex.codecogs.com" [Network.Socket.connect: <socket: 804>: failed (Connection refused (WSAECONNREFUSED))]))
Error: processing vignette 'intro_to_gtfs2gps.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building 'intro_to_gtfs2gps.Rmd'

SUMMARY: processing the following file failed:
  'intro_to_gtfs2gps.Rmd'

Error: Vignette re-building failed.
Execution halted