if (lanes == null) return;
final String forward = Utils.firstNonNull(p.get("lanes:forward"), "0");
final String backward = Utils.firstNonNull(p.get("lanes:backward"), "0");
try {
if (Integer.parseInt(lanes) < Integer.parseInt(forward) + Integer.parseInt(backward)) {
errors.add(new TestError(this, Severity.WARNING,
tr("Number of {0} greater than {1}", tr("{0}+{1}", "lanes:forward", "lanes:backward"), "lanes"), 3101, p));
}
} catch (NumberFormatException ignore) {
Main.debug(ignore.getMessage());
}