at 0.5% agar, bacteria shows swarming ability. If you increase agar concentration, you may see no motility what you desire. At 1.5% agar concentration we just see colonies
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Use bottom layer of 15 g/L agar and afetr solidification a soft agar(0.7% agar) seeded with your motile organism is added.You will easily check motility on a marked central line as diffused growth.