You have an error:

this.vehicleService.getVehicle().subscribe(vehicle => {
        this.vehicle = vehicle;
})

but in your html you refer to let vechicle of vehicles

You should add an "s" to your this.vehicle to your subscription like so:

this.vehicleService.getVehicle().subscribe(vehicle => {
        this.vehicles = vehicle;
})

You have an error:

this.vehicleService.getVehicle().subscribe(vehicle => {
        this.vehicle = vehicle;
})

but in your html you refer to let vechicle of vehicles

You should add an "s" to your this.vehicle to your subscription like so:

this.vehicleService.getVehicle().subscribe(vehicle => {
        this.vehicles = vehicle;
})

Edit: Just forgot to meantion to change the local variable vehicle: Vehicle[] to vechicles: Vehicle, but that you figured out that yourself! ;)