local p = {}  local types = mw.loadData("Module:Road data/RJL types")  local row  local columns = { -- Constants for how many columns different list types should have.  default = 6, -- default  exit = 7, -- default + exit number  old = 8, -- default + exit number + old exit number }  local function parameterParser(args)  local keysParam = args.keys  if not(keysParam) then return {} end  local keys = mw.text.split(keysParam, ",")  table.sort(keys)  return keys end  local function createLegend(key)  local legend = row:tag('div'):addClass('hlist'):cssText("margin-left:1.6em;text-align:center;font-size:90%"):tag('ul')  for k,v in ipairs(key) do  local type = types[v]  if type then  legend:tag('li'):tag('span'):css('border', '1px solid #000'):css('background-color', type.color):css('color', type.color):wikitext("&nbsp;&nbsp;&nbsp;&nbsp;"):done():wikitext("&nbsp; "):wikitext(type.jctbtm)  end  end end  function p._jctbtm(args)  local root = mw.html.create()  row = root:tag('tr'):tag('td')  local cols = args.col or columns[args[1]] or columns.default -- Compute the number of columns, either from an explicit parameter, or by looking at the columns table.  row:attr('colspan', cols):addClass('wikitable hlist'):css("text-align", "center"):css("background-color", "#eaecf0") -- Define the footer.   if (args.conv or 'yes') == 'yes' then  row:wikitext("1.000&nbsp;mi = 1.609&nbsp;km; 1.000&nbsp;km = 0.621&nbsp;mi<br>")  end   local key = parameterParser(args)  if key[1] then createLegend(key) end   local keyParam = args.key  if keyParam then -- This is a deprecated parameter  local page = mw.title.getCurrentTitle()  local pagename = page.prefixedText  row:wikitext(string.format("[[Category:Jctbtm temporary tracking category|# %s]]", pagename))  end   row:wikitext(args.notes or args.key) -- If additional notes are provided, display them.   if #row.nodes == 0 then  return '|-\n|}'  else  return tostring(root) .. '\n|-\n|}'  end end  function p.jctbtm(frame)  return p._jctbtm(require('Module:Arguments').getArgs(frame)) end  return p