CakePHP 3 - 创建多选下拉列表

Using CakePHP 3 framework.

First of all, I don't know if this is possible.

What I have now

• Multiselect checkbox list.

Example

• Bikes 1 checkbox
• Bikes 2 checkbox
• Bikes 3 checkbox
• Cars 1 checkbox
• Cars 2 checkbox

The user is now allowed to select al 5 items.

TODO

• Users many-many relation with Vehicles
• Users is allowed to select one per group.

Example TODO (my idea)

• Dropdown bikes [ Bikes 1, Bikes 2, Bikes 3 ]

• Dropdown cars [ Cars 1, Cars 2 ]

The user needs to be only allowed to choose one per group.

Is it possible to achieve this by one array?

EDIT

Is it possible to group a list, like the example above, of radiobuttons?