This would so good in portland
Flat 1/8 inch steel sharpened with points would cut legs off. But a propane with check valves fitted to 1 inch steel piping capped off with small holes drilled every foot or so with a bbq lighter fitted to both sides would do best. Burn them alieve . Strongly considering selling after market vechichle modifications including spiked bumpers gasoline dumpers a skill saw that rest on a unfolding arm that unfolds out , on ebay for all those interested in protecting themselves in any sort of riot situation.