Danville is poised to enforce a ban on e-bikes and scooters in public parks and reduce the speed limit on trails. The affluent city of about 43,000 East Bay residents has seen an uptick in young, mostly middle-school aged children driving the vehicles recklessly in city parks, officials said. Now the city is trying to curb what they say is dangerous driving by decreasing the speed limit on trails to 15 mph and issuing citations to offenders.