The "A" routes go from city to city with no way to get off in between. Don't look for interchanges to take you from one "A" or "N" route to another. They mostly don't exist. Instead, go to "Centre Ville" or city center to pick up the new route. Lastly, a sign announcing a turn doesn't necessarily mean at the next intersection. Directions are very clear in France, much less so in Belgium.