What important symbolic qualities does the land turtle have as described in chapter 3?

The land turtle in chapter 3 has perseverance, blind faith, and ignorance.  First, it keep struggling to cross the road even despite the struggles against traffic.  Without perseverance, the turtle would have given up and stayed on the side of the road it was on.  Next, blind faith is apparent because the turtle has no guarantee that there is anything better on the other side of the road, but he still ventures across.  Finally, ignorance of the danger of the traffic sends the turtle on the very dangerous trek across the highway.  This is all symbolic of the migrant workers who venture across the country in hopes of better lives.