Something

				// Calculate $transportPrice
				$c = new Criteria();
				$c->add(TownsDistancesPeer::TOWN_A, 1);
				$c->add(TownsDistancesPeer::TOWN_A, 2);
				$row = TownsDistancesPeer::doSelectOne($c);
				
				$transportPrice = $row->getDistance();


this will throw this error:
 [wrapped: Could not execute query [Native Error: Unknown column 'towns_distances.ID' in 'field list'] [User Info: SELECT towns_distances.TOWN_A, towns_distances.TOWN_B, towns_distances.DISTANCE, towns_distances.ID FROM towns_distances WHERE towns_distances.TOWN_A=2 LIMIT 1]]

  towns_distances: 
    town_a: 
      type: INTEGER
      required: true
      default: 
      foreignTable: town
      foreignReference: id
      onDelete: RESTRICT
      onUpdate: RESTRICT
    town_b: 
      type: INTEGER
      required: true
      default: 
      foreignTable: town
      foreignReference: id
      onDelete: RESTRICT
      onUpdate: RESTRICT
    distance: 
      type: FLOAT
      required: true
      default: 0
    _indexes: 
      town_b: 
        - town_b
    _uniques: 
      town_a: 
        - town_a
        - town_b