">
    <colgroup><col class="name" /><col class="desc" /></colgroup>
    <tr>
      <th>from</th>
      <td><p>Text string or coordinates (a numeric vector of
<code>length = 2</code> representing latitude and longitude) representing a point
on Earth.</p></td>
    </tr>
    <tr>
      <th>to</th>
      <td><p>Text string or coordinates (a numeric vector of
<code>length = 2</code> representing latitude and longitude) representing a point
on Earth. This represents the destination of the trip.</p></td>
    </tr