In the commercial vehicle segment, domestic sales were down by 5.98 per cent to 68,680 units last month, SIAM said.
Similarly, the data pointed out that three-wheelers' sales decelerated. The segment's offtake went down by 7.44 per cent to 46,262 units during the month in consideration.
In addition, overall sales of two-wheelers, which include scooters, motorcycles and mopeds, edged lower by 16.36 per cent to 1,638,388 units.
As per the data, total sales of the Indian automobile sector declined by 15.93 per cent during April 2019 to 2,001,096 units across segments and categories.
However, overall exports of vehicles across categories was higher by 0.05 per cent to 400,656 units.