re: Weeds in cracks of driveway

You might try one of these to control the weeds. LINK I use one for weeds in cracks in the driveway, along street curb, patio, etc when I don’t feel like mixing herbicide for that use only. I won’t say it’s any more effective than Roundup, b/c weeds still come back, but it’s easy and pretty quick.
Ordered mine on-line, but I see them for at Home Depot next to where they sell the propane cylinder cartridges.