def plot_line(m, line, colour='b', lw=1, alpha=1):
    """
    Plots a line given a line with lon,lat coordinates.

    Note:
        This means you probably have to call shapely `transform` on your
        line before passing it to this function.

        There is a helper partial function in utils called `utm2lola` which
        makes this easy.

    Args:
        m (Basemap): A matplotlib Basemap.
        line (shape): A shapely geometry.
        colour (str): A colour from the matplotlib dictionary.

    Returns:
        list: A list of matplotlib lines.
    """
    lo, la = line.xy
    x, y = m(lo, la)
    return m.plot(x, y,
                  color=colour,
                  linewidth=lw,
                  alpha=alpha,
                  solid_capstyle='round')