straight城区直行

• 用途：创建straight城区直行的静态场景（地图）
• 参数：参数如下表.

  表1 straight城区直行参数

  Parameter	Type	Mandatory	Description
  lane_width	length	yes	每个车道宽度.
  left_lane_num	int	yes	左侧车道数量.
  right_lane_num	int	yes	右侧车道数量.
  bikeway	bool	yes	是否有自行车道.
  sidewalk	bool	yes	是否有人行道.
  main_speed	speed	yes	主路的限速值.
  road_length	length	yes	主路的长度.

• 参数取值范围：

lane_width: length = [3m..4m] 
left_lane_num: int = [0, 1, 2, 3, 4]
right_lane_num: int = [1, 2, 3, 4]
bikeway: bool = [true, false]
sidewalk: bool = [true, false]
main_speed: speed = [40kph..60kph]
road_length: length = [150m..500m]

my_straight: straight with:
    keep(it.lane_width == 3m)
    keep(it.left_lane_num == 0)
    keep(it.right_lane_num == 3)
    keep(it.bikeway == false)
    keep(it.sidewalk == false)
    keep(it.main_speed == 60kph)
    keep(it.road_length == 500m)

create创建

my_straight: straight = scenery.create_straight(lane_width: 3m, left_lane_num: 0, right_lane_num: 3, bikeway: false, sidewalk: false, main_speed: 60kph, road_length: 500m)