Customized version of http://www.thingiverse.com/thing:739080

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=739080

Using the following options:

block_height_ratio = 1
roadway_length2 = 20
slope_stud_rows = 1
block_width = 25
roadway_width = 20
roadway_x2 = 0
stud_type = hollow
roadway_y = 0
roadway_x = 0
use_reinforcement = no
slope_end_height = 0
wing_end_width = 2
block_brand = lego
roadway_y2 = 6
curve_type = concave
wing_type = full
wing_stud_notches = yes
curve_end_height = 0
curve_stud_rows = 5
roadway_length = 0
dual_sided = no
stud_rescale = 1
roadway_width2 = 8
wing_base_length = 3
block_length = 25
vertical_axle_holes = no
technic_holes = no
block_type = baseplate