Crazyness
The routes are set as territorial as DRob mentions. You have to view the logistics and transport history of the area to make some sense of the existing route. 15-17 years back there was little scheduled and non-scheduled public transport into the zone, most heavy transport was that of the resorts for private carriage of their employees from Higuey on the existing road system. Veron/Beron was nothing more than a sparsely populated crossroad having traffic directed toward the airport or to Bavaro. Fruisa crossroad had one major building, Friusa, a vendor of restaurant equipment for the resorts. If you needed fuel for your vehicle you would have to travel to Higuey to encounter a commercial vendor.
The area prospered, and grew with commerical and residential construction. Traffic, private and public, continued from Higuey. the known major public transport stops were in the areas of Veron crossroad transiting to the Coco Loco crossroad (near the San Juan mall), making circuitous route to Cortecito, Plaza Bavaro, Friusa, and back to Coco Loco. Large population groups and commercial areas clustered around the stops. Veron is working class and commercial, Coco Loco is commercial, Cortecito is commercial and residential, Plaza Bavaro is commercial with some residential, and the Friusa is commercial and working class residential. The airport traffic as far as public transport was nothing more than a hold over of an existing route servicing the populace of Juanillo prior the the Cap Cana land grab. Now existing public transport includes stops near the airport and Nuevo Junaillo.
The then and now public transport stops exist to service the population and commercial areas around them. The public transport routes to the stops are grandfathered in to the sindicates and there is little chance of deviation without a major crisis amongst them over territory rights. The new highway corridor from the rotary/roundabout at Punta Cana to the Fruisa area is a ripe apple for a new public route direct to the airport from Friusa. However, the market it serves is mostly private for hire, taxis, and group buses intended for the tourist trade. The sindicates do have their eyes on it, yet they gain more in fares by maintaining the Friusa, to Coco Loco, to Veron route with a change of bus at Veron for the public destined to the Punta Cana airport zone.
Note: The above is nothing more than a nuts and bolts explanation of the crazyness.
Regards,
PJT