public function maybe_redirect( $wp_obj ) {

			if ( is_admin() ) {
				return;
			}

			// is this a 404?
			if ( ! is_404() ) {
				return;
			}

			// is this a request for a vehicle or vehicle archive?
			if ( ! $this->is_request_for_vehicle_archive( $wp_obj ) && ! $this->is_request_for_vehicle( $wp_obj ) ) {
				return;
			}

			// base link to the inventory page.
			$url = get_post_type_archive_link( INVP::POST_TYPE );

			// get the make out of the slug.
			$make = $this->extract_make( $wp_obj );
			if ( ! is_string( $make ) || '' == $make ) {
				// no make, redirect to vehicle archive.
				wp_safe_redirect( $url, 302 );
				exit;
			}

			// are there cars in this make?
			$term = get_term_by( 'slug', $make, 'make' );
			if ( ! $term || 0 === $term->count ) {
				// no cars in this make, go to vehicle archive.
				wp_safe_redirect( $url, 302 );
				exit;
			}

			// redirect to this make's archive.
			$url = get_term_link( $make, 'make' );
			if ( is_wp_error( $url ) ) {
				// no link created for this make? go to vehicle archive.
				wp_safe_redirect( $url, 302 );
				exit;
			}

			wp_safe_redirect( $url, 302 );
			exit;
		}