South India motorcycle tour riding: why 140 km takes four hours

Why south India motorcycle tour riding runs on a slower clock

Start with the government's own number. The Bharatmala booklet the Press Information Bureau published in November 2022 puts the average speed on the national highway network at 32 km/h. That is the baseline for the best roads in the country, before you add a coast.

Then the law. Kerala's Motor Vehicles Department still shows its 2014 order: a motorcycle may do 60 km/h on a national highway, 50 on a state highway, 45 on a ghat road and 50 inside a municipality. The 2023 revision, per Onmanorama, cut the two-wheeler ceiling from 70 to 60, and the department's page has not caught up. So: 60 on the best road in Kerala, 45 on the ghats.

140 km at a legal 60 with nothing in the way is two hours twenty. The coast road runs through its towns, not round them, wherever the bypass is not yet built. Four hours is the honest number, and the day you beat it, you were speeding.

NH 66 is a highway being built around you

The Ministry of Road Transport's list of national highways puts NH 66 at 1,640.66 km from Panvel to near Kanyakumari, 677.77 km of it in Kerala and 294.14 km in Karnataka. Kerala is widening 643 km of its share to six lanes in 17 reaches, Kerala Kaumudi reported in July 2024.

The finish date has moved four times in twelve months, so here are all four. October 2025: the state's public works minister said 450 km were done and the road would open by January 2026. December 2025: the Union minister told the Lok Sabha March, after the highway had collapsed at three places in six months. April 2026: Kerala Kaumudi reported it would not finish this year, with collapses at Kooriyad and Mylakkadu and an alignment change behind the delay. October 2026: Onmanorama reported NHAI had pushed the Kannur reach to April 2028.

On a bike that means diversions onto half-finished service roads, and two-way traffic on one carriageway. Ride every orange barrel as a lane change nobody told you about. Karnataka is further along: Talapady to Mulki is four lanes, Daijiworld reported in September 2026, quoting NHAI's Mangaluru office.

The traffic is scooters, and they live here

Kerala had 182 lakh registered vehicles in March 2025, 118.67 lakh of them two-wheelers, by the State Planning Board's Economic Review 2025. About 65 in 100, my arithmetic. Tamil Nadu goes further: 3.59 crore vehicles in May 2024, 84.09 per cent two-wheelers, by its Transport Department's own policy note.

Add the roads. The ministry's Basic Road Statistics 2019-20 gives Kerala 6,650 km of road per 1,000 sq km against 1,935 for India, nearly three and a half times the national density. A scooter joining from the left is not an event here. It is the road.

Then the buses. Tamil Nadu runs 30,881 stage carriage buses, 20,260 of them state-owned, by the same policy note. Ride as if the bus behind you is late and the one ahead will stop without warning.

The ghats: hairpins, trucks and a court order

Thamarassery Churam on NH 766 is the climb everyone names: nine hairpins over 14 km from Adivaram to the Lakkidi viewpoint at 800 m, in Kerala Tourism's description. Since June 2026 the Kozhikode collector has barred heavy multi-axle vehicles from the ghat between 6 am and 8 pm, Onmanorama reported, which means fewer trucks on the bends in daylight.

Dhimbam ghat on NH 948 is the one with paperwork. The Madras High Court's judgment of 6 April 2022 records 9 km of ghat with 27 steep hairpins and sets the rules: two-wheelers between 6 am and 9 pm only, trucks capped at 20 km/h, anything with 12 wheels or more banned. The Kalhatty road from Masinagudi to Ooty, 36 hairpins by Tamil Nadu Tourism's count, is under a 2026 High Court order allowing 200 tourist vehicles a day, and forest officials told Onmanorama in September the quota is usually gone by 11 am.

Bandipur is the gate that catches riders. NH 766 through the tiger reserve has had a night ban since 2009, upheld by the Supreme Court in 2019. PTI gave the hours as 9 pm to 6 am in April 2025; Onmanorama gave 8.30 pm to 6 am in January 2026. Be through by 8.30. A bus climbing a hairpin uses the whole road to make the turn. Give it the road, then take yours.

Humidity: why you are finished by eleven

The IMD's 1991 to 2020 normals, filed with the World Meteorological Organization, give Mangalore airport a mean relative humidity of 65 per cent in January, 70 in April, 89 in July and 82 in October. October, when the riding window opens, averages a 31.2 degree C maximum at 82 per cent humidity. The pairing is the problem, not the temperature.

The IMD's own heat wave FAQ says why: high relative humidity slows the evaporation of sweat and cuts the body's cooling efficiency. NIOSH, the US occupational health institute, puts a number on it in its 2016 heat standard: once the heat index passes 35 degrees C largely because of humidity, evaporative heat loss is, in its words, virtually nonexistent. You keep sweating. You keep losing water. You do not get cooler.

So the desert tricks fail. A soaked evaporative vest works in dry air because the air pulls the water out; at 82 per cent it has little to evaporate into. Mesh vents air that is already wet. Drink on a schedule, not on thirst, and put the long legs in the first three hours. Rain is the other half: Mangalore airport averages 28 rainy days in July and still 10 in October. The north-east monsoon's normal onset over coastal Tamil Nadu is 20 October; in 2026 the IMD declared it under way on 15 October.

The crash numbers, read properly

The ministry's Road Accidents in India 2023 counts 4,80,583 crashes and 1,72,890 deaths, two-wheeler riders 44.8 per cent of the dead. Tamil Nadu had the most crashes of any state for five straight years to 2023, 67,213 that year, and the second most deaths, 18,347. Kerala was third in crashes, 48,091, and seventeenth in deaths, 4,080; 2,233 of those dead were on two-wheelers, 55 per cent by my arithmetic.

The 2024 edition, out in June 2026, changes none of it: two-wheelers rose to 46.2 per cent of deaths and both states held their ranks. Kerala's crashes are many and mostly survivable, which is what dense, slow traffic produces. Tamil Nadu's are many and lethal. The road that lets you open the throttle is the road that kills.

How we run the South

Our eleven-day circuit is sealed road the whole way, Thamarassery's nine hairpins included. Days run 60 to 380 km and three to eight hours in the saddle; the longest is Hampi to South Goa, about 380 km on NH 66, seven to eight hours with stops, with a support vehicle and mechanic behind eight to twelve riders. Ask whoever you ride with how they set the hours on the itinerary. If the answer is distance divided by 60, nobody has ridden the road lately.